Curriculum Vitae -   Jan C. Willems


Professional biography

Jan C. Willems was born in Bruges in Flanders, Belgium. He studied engineering at the University of Ghent. After his graduation in 1963, he went to the US, and obtained the M.Sc. degree from the University of Rhode Island in 1965, and the Ph.D. degree from the Massachusetts Institute of Technology in 1968, both in electrical engineering.

      He was an assistant professor in the Department of electrical engineering at MIT from 1968 to 1973, with a one year leave of absence at DAMPT, the department of applied mathematics and theoretical physics, of the University of Cambridge. In his dissertation he worked on input/output stability, under the direction of Roger W. Brockett, presently at Harvard University. This research led to the monograph The Analysis of Feedback Systems, MIT Press, 1971. He subsequently worked on optimal control, in particular on linear-quadratic problems with indefinite cost and associated questions related to the Riccati equation. Out of this work, the notion of a dissipative system and the linear matrix inequality (LMI) emerged as the main concepts and analysis tools. In the 80's and 90's these ideas came to play a central role in the synthesis of robust controllers.

      On February 1, 1973, he was appointed Professor of Systems and Control in the Mathematics Department of the University of Groningen. His interests turned to geometric control and questions of disturbance decoupling. He introduced the notion of almost invariant subspaces which allows the solution of a number of control problems involving high gain feedback.

      In the mid 80's, he became conscious of the limitations of input/output thinking as the framework for the analysis and synthesis of open and interconnected systems. This uneasiness led him to develop what is called the behavioral approach, in which a dynamical system is simply viewed as a family of trajectories. This work also emphasizes the importance, for example in object oriented modeling, of latent variables in addition to the manifest variables which the model aims at. In the behavioral setting, interconnection is viewed as variable sharing, and control is viewed as interconnection, with feedback as an important special case. The original ideas were introduced in an early paper in the, now defunct, Italian journal Ricerche di Automatica. A more extensive development appeared in a 3-part paper in Automatica  in 1986-87, and in a paper in Dynamics Reported  in 1989.  Other convenient sources for these ideas are two papers in the IEEE Transactions on Automatic Control (1991 and 1997), a textbook (co-authored with Jan Willem Polderman) published by Springer Verlag, and an expository article published in the IEEE Control Systems Magazine in 2007. In 1988, he was awarded the Automatica Prize Paper Award for the series of 3 articles in which the behavioral framework was put forward.

      In 2003, Professor Willems became emeritus professor from the University of Groningen. He gave his farewell lecture on January 13, 2004. Presently he is guest professor at the department of electrical engineering, with the research group on Signals, Identification, System Theory and Automation (SISTA), at the K.U. Leuven, Belgium. During the academic year 2003-2004, he held the Chaire Francqui at the  Faculty of Applied Sciences of the Université catholique de Louvain.

      Professor Willems is a fellow of the IEEE and of SIAM. He has held the unavoidable administrative positions in his department at the University of Groningen, including a six year term as director of research. He served terms as chairperson of the European Union Control Association and of the Dutch Mathematical Society (Wiskundig Genootschap). He has been on the editorial board of a number of journals, in particular, as managing editor of the SIAM Journal of Control and Optimization and as founding and managing editor of Systems & Control Letters.

      In 1998, he received the IEEE Control Systems award. In 2010, he became doctor honoris causa from the Université de Liège.

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Extensive professional biography

Present position
Guest Professor
Research group on Signals, Identification, System Theory and Automation (SISTA)
Department of Electrical Engineering, K.U. Leuven
Kasteelpark Arenberg 10, B-3001 Leuven-Heverlee, Belgium
Telephone: +3232390529; secretary: +3216321709; Fax: +32163211970.
email: Jan'dot'Willems'at'esat'dot'kuleuven'dot'be
URL:   http://www.esat.kuleuven.be/~jwillems
Former positions
1973-2003: Professor of Systems and Control (presently emeritus)
Department of Mathematics and Computing Science, University of Groningen, The Netherlands

1968-1973:  Assistant Professor of Electrical Engineering
Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

The MIT Electrical Engineering Control group in 1972.

From left to right: Lenny Gould, Sanjoy Mitter, Mike Athans, Fred Schweppe, and Jan Willems.
Education
1965-1968:  Graduate School of Electrical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
Doctor of Philosophy, June 1968
Ph.D. dissertation: Nonlinear Harmonic Analysis, supervisor: R.W. Brockett

Five generations of Ph.D. supervision.

From left to right: Michael Rotkowitz, Sanjay Lall, Keith Glover, Jan Willems, and Roger Brockett.
Photograph taken at the dinner of the conference on the occasion of the 60th birthday of Keith Glover at Gonville and Caius College in Cambridge, England, on April 22, 2006.

1963-1965:  Graduate School of Electrical Engineering, University of Rhode Island
Master of Science, June 1965
M.Sc. thesis: The Statistical Properties of the Slope of a Wind Driven Surface in a Model Tank

1958-1963: Faculty of Engineering, University of Ghent, Belgium
Degree of Electromechanical Engineer, July 1963
Engineering thesis: The Magnetic Field at the End Windings of a Turbogenerator

Professional field and research interests
Principal research areas:
     Systems theory, control, modeling
     Representation questions, system identification
     Applications in control engineering, physics, and econometrics

Present research program:
      The development of the behavioral approach to systems theory
      Modeling of open dynamical systems
      Algorithms for modeling based on tearing, zooming, and linking
      Model reduction and system identification
      Dissipative systems
      Control in a behavioral setting
Professional activities
Chairperson, selection committee for the IEEE CSS Antonio Ruberti Young Researcher Prize (2005-2010)
Director, Research Institute of Mathematics and Computing Science, University of Groningen (1993-1998)
Chairperson, Department of Mathematics and Computing Science, University of Groningen (1986-1989)
President of the European Union Control Association (EUCA) (1993-1995)
President of the Dutch Mathematical Society (Wiskundig Genootschap) (1994-1996)
Chairperson of the Board of the Dutch Institute of Systems and Control (DISC) (1995- 2001)
Chairperson of Dutch Institute of Systems and Control (DISC) (National Graduate Program) (1986-1995)
Chairperson of the Johann Bernoulli Foundation for Mathematics (1988-1997)
Chairperson of the Selection Committee for the 1990 Brouwer Medal
Member of IEEE, SIAM, Dutch Mathematical Society (Wiskundig Genootschap), American Mathematical Society
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Awards and honors
2010  doctor honoris causa from the Université de Liège.

Rodolphe Sepulchre, Jan Willems, and Bernard Rentier (Rector of the Université de Liège).

Photograph taken at the doctor honoris causa ceremony on October 16, 2010.

2003-2004  Chaire Francqui at the Faculty of Applied Sciences of the Université catholique de Louvain

1998 IEEE Control Systems award "For seminal contributions to control theory and leadership in systems research"

1998 IEEE Control Systems Magazine outstanding paper award

Invited speaker at the 1998 International Congress of Mathematicians, Berlin

Festschrift: Three Decades of Mathematical System Theory,A Collection of Surveys at the Occasion of the 50th Birthday of Jan C. Willems (Editors H. Nijmeijer and J.M. Schumacher)
Lecture Notes in Control and Information Sciences, Volume 135, Springer Verlag, 1989

1987 Automatica prize paper award

Since 1980  Fellow of the IEEE (presently Life Fellow)

1963-1965: Fulbright fellowship for graduate study in the US
Named lectures
Antonio Ruberti lecture, Rome, 2007
Peter Sagirow lecture, Stuttgart, 2006
Miegunyah public lecture, Melbourne, 1997
Zaborsky lecture, St Louis, 1993

Visiting appointments

November 2006: Visiting professor, Kyoto University
March-May 2005: Visiting professor, Kyoto University
May-June 2003: University of Osaka and Kyoto University
September - December 1998: Harvard University
January - March 1997: Miegunyah visiting professor, University of Melbourne
October - November 1995: Distinguished lecturer, Indian Institute of Technology, Bombay
March 1994: California Institute of Technology
September - November 1992: Control Theory Year, IMA, University of Minnesota
June 1991: IIASA, Laxenburg, Austria
February 1989: Distinguished visiting professor, Arizona State University
July 1988: IMA, University of Minnesota
September 1986: IIASA, Laxenburg, Austria
July-August 1983: JSPS Fellow, Osaka University, Japan
March 1983: University of Southern California
Summer 1981: Laboratory for Information and Decision Systems, MIT
December 1978: Ben Gurion University, Beer Sheeva, Israel
November 1975 - February 1976: Visiting Professor, ETH, Zürich
Summer 1975: University of Rome
Summer 1974: Vinton Hayes Visiting Fellow, Harvard University
January 1973: Viisting Professor, University of Florida
May 1972: IRIA, Rocquencourt, France
September 1970 - August 1971: Postdoc, University of Cambridge, UK
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Jan Willems with some of his former Ph.D. students.

From left to right, front row: Keith Glover, Madhu Belur, Siep Weiland, Arjan van der Schaft, Henk Nijmeijer, Harry Trentelman, Jan Willem Polderman; second row: Tommaso Cotroneo, Paolo Rapisarda, Paula Rocha, Fabio Fagnani, Berend Roorda, Christiaan Heij, Tonny ten Dam. Photograph taken on the occasion of the 60th birthday of Jan Willems on September 18, 1999.


Ph.D. dissertations supervised
Name / present position / title of doctoral dissertation / institution / year
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Master's theses supervised supervised

   At the University of Groningen

    At the Massachusetts Institute of Technology Go totop

Editorial activities
Founding and Managing Editor of Systems & Control Letters (1981-1994)

Editor-in-Chief of SIAM Journal on Control and Optimization (1989-1993)

Member, Editorial Board
Systems & Control Letters (1981-2009)
Acta Applicandae Mathematicae (1982-2008)
Multidimensional Systems and Signal Processing (1989-2011)
SIAM Journal on Control and Optimization (1981-2005)
Mathematics of Control, Systems, and Signal Processing (1988-1998)
Applied Mathematics and Computation (1988-1995)
Mathematical Models and Methods in Applied Science (1989-1995)
IEEE Transactions on Automatic Control (1971-1973)
Dynamics Reported (1986-1991)
Dynamics and Stability of Systems (1985-1994)
Applied Mathematics Letters (1988-1992)
Control - Theory and Advanced Technology (1985-1990)
RAIRO Automatique (1981-1987)
Annals of Systems Research (1978-1979)
Journal of Applied Science and Engineering (1975-1978)
Soviet Encyclopaedia of Mathematics - English Translation
Systems & Control: Foundations and Applications, Birkhäuser (1989-1999) (Bookseries)
Progress in Systems and Control Theory, Birkhäuser (1988-1994) (Bookseries)
Advances in Mathematics for Applied Sciences, World Publishing Co. (1989-2002) (Bookseries)
Popov special issue, European Journal of Control, 2001 (Guest editor)
Special issue on Parametrization Problems in Control, Journal of Linear Algebra and Its Applications Vol. 122/123/124, 1989 (Guest editor)
Special issue on Linear Systems,  IMA Journal of Mathematical Control and Information, Vol. 3, Nos 2/3, 1986 (Guest editor)
IEEE Transactions on Automatic Control, Vol. 26, No. 4, 198, Bellman special issue (Guest associate editor)
IEEE Proceedings, Vol. 64, No. 1, 1967, Special issue on Recent Trends in System Theory (Guest associate editor)

Main activities regarding organization of conferences

Organizer (with Y. Ohta, S. Hara, and H. Fujioka) of the symposium on Systems, Control, and Signal Processing, Kyoto, Japan, March 29-31, 2010, on the occasion of the 60-th birthday of Yutaka Yamamoto

Member (with B. De Moor, P. Van Dooren, and V. Blondel) of the scientific organizing committee of the 2004 MTNS

Organizer (with J. Baillieul) of the conference Perspectives in Control, Cambridge, MA, October 23-24, 1998, on the occasion of the 60-th birthday of R.W. Brockett

Organizer (with H.L. Trentelman) of the Workshop on Control of Uncertain Systems on the occasion of the Bernoulli year, August 29 - September 1, 1995

Chairperson, Organization Committee of the 1993 European Control Conference (ECC'93) Groningen, June 28-July 1, 1993 (600 participants)

Chairperson, Organization Committee 1984 Dutch Mathematical Congress

Co-Director (with M. Hazewinkel) of the Advanced Study Institute on Stochastic Systems: The Mathematics of Filtering and Identification, Les Arcs, June 23 - July 4, 1980
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External colloquia, seminars, conference lectures

2005

2004

Inaugural Lecture, Francqui chair, Université de Louvain
Afscheidscollege (Last Lecture), R.U. Groningen
Colloquia: University of Aveiro, Portugal, University of Padova.
Laudatio for the Johann Bernoulli lecture of Bart De Moor
Conference on Decision and Control, The Bahamas (2 lectures);
Conference on Observation and Estimation, Sde Boker, Israel (2 invited lectures);
16-th International Symposium on the Mathematical Theory of Networks and Systems, Leuven (tutorial);
ERNSI workshop, Budapest, Hungary (contributed lecture).

2003

Colloquia: RWTH-Aachen; University of Osaka (3 lectures); Kyoto University (3 lectures); University of Southern California; University of California at Santa Barbara (2 lectures);
Conference on Decision and Control, Maui, Hawaii (2 invited lectures);
Conference of the Society of Information and Control Engineering (Japan), Kobe (plenary lecture);
European Control Conference (ECC'03), Cambridge, UK (minicourse);
ERNSI workshop, Noordwijkerhout, NL (contributed lecture).
2002
Colloquia: University of Amsterdam; KULeuven (2x); Université de Louvain (2x);  University of Aveiro, Portugal (2x); University of Twente; Free University of Brussels.
Oberwolfach Tagung über Regelungstheorie (2 lectures);
15-th International Symposium on the Mathematical Theory of Networks and Systems, Notre Dame, IN (semi-plenary lecture, mini-course lecture, 2 contributed lectures);
Controlo 2002, Aveiro, Portugal (plenary lecture);
Conference on New Directions in Mathematical Systems Theory and Optimization, Stockholm, Sweden,  on the occasion of the 60-th birthday of Anders Lindquist (invited lecture);
Conference on Decision and Control, Las Vegas, NE (invited lecture).

2001

Colloquia: University of Vienna; Technical University of Vienna; University of Innsbruck; Rice University; ETH Zürich; INRIA in Sophia-Antipolis.
Festkolloquium on the occasion of the 60-th birthday of I. Troch, Vienna (keynote lecture);
Conference on Dynamical Systems and Control, Houston, Texas  on the occasion of the 70-th birthday of B. Pearson (invited lecture);
System Theory Day, University of Groningen on the occasion of the 60-th birthday of Ruth Curtain (lecture);
Conference on Chemical Process Control, Tucson, Arizona (plenary lecture);
Conference on Decision and Control, Orlando (contributed lecture).

2000

Colloquia: Eindhoven University of Technology; MATLAB, Inc., Natick, MA; Delft Control.
Conference on Mathematical Modeling, Vienna (plenary lecture)
Conference on Coding and Systems, Cambridge, Massachusetts  on the occasion of the 60-th birthday of David Forney (invited lecture);
Conference on N-D Systems, Czocha Castle, Poland (invited lecture);
Workshop on Systems Modelling, University of Twente (lecture);
KNAW Workshop on Constructive Methods in Algebraic Systems Theory (invited lecture);
Workshop on Robust Control, Newcastle, Australia (contributed lecture);
Two-day short course on The Behavioral Approach to Systems and Control, Pre-CDC program, Sydney Australia (4 lectures);
Conference on Decision and Control, Sydney, Australia (contributed lecture).

1999

Colloquia: IEEE Benelux chapter; University of Padova; University of Twente; University of Bielefeld.
Conference on Matheamtical Systems Theory, Borkum, Germany on the occasion of the 60-th birthday of Diederich Hinrichsen (invited lecture);
Conference on EU graduate programs, Padova (invited lecture);
Conference on Nonlinear Control, Porto, Portugal (invited lecture);
Conference on New Directions in Control, Cascais, Portugal (invited lecture);
Summer course on Systems and Control, Arrabida, Portugal (3 lectures);
Workshop on Robust Control, Hong Kong (special evening lecture);
 IFIP Conference on Systems Modeling and Optimization, Cambridge, UK (plenary lecture);
Summer program on Coding and Signal Processing, IMA, Minneapolis (invited lecture);
Conference on Advances in Systems Theory, Cambridge, Massachusetts on the occasion of the 65-th birthday of S.K. Mitter (opening lecture);

1998

Colloquia: Royal Institute of Technology, Stockholm; University of Dortmund; MIT (2x); University of Maryland; University of Illinois; Boston University; Yale University; Harvard University.
Conference Perspectives in Control, Paris  on the occasion of the 60-th birthday of Ioan Landau (invited lecture);
International Congress of Mathematicians, Berlin (invited lecture);
Control meeting for ABB, Vasteras (invited lecture);
13-th International Symposium on the Mathematical Theory of Networks and Systems,MTNS, Padova (semi-plenary lecture);
Conference on Future Directions in Control, Bellaria (invited lecture);
DISC Summer School (2 lectures).

1997

Colloquia: University of Melbourne (3x); RMIT, Melbourne; Australian National University, Canberra; Politechnico di Torino, Italy (6x); Rice University.
Miegunyah public lecture The Myth and Magic of Math, University of Melbourne;
System Theory Day, University of Twente  on the occasion of the 60-th birthday of Huibert Kwakernaak (opening lecture);
Conference on Open Problems in Control, Liège;
European Control Conference (ECC'97), Brussels (contributed lecture);
European Science Foundation Workshop on Complex Systems, Groningen (lecture);
Workshop on Systèmes Algebriques, Marseille (2 invited lectures);
Conference on Decision and Control, San Diego (contributed lecture).

1996

Colloquia:  Kaleidoscoop, Dutch Mathematical Society.
Oberwolfach Tagung on Coding Theory (invited lecture);
AMS-Benelux Mathematical Congress, Antwerp (contributed lecture);
12-th International Symposium on the Mathematical Theory of Networks and Systems, St Louis (semi-plenary lecture);
Oberwolfach Tagung über Regelungstheorie (invited lecture);
Conference on Decision and Control, Kobe, Japan (2 contributed lectures).

1995

 Colloquia: University of Lund (4x); University of Linköping; University of California at Berkeley; IIT, Bombay (8x).
Workshop on Control and Optimization, Sint Petersburg (invited lecture);
Mathematical Congress, Groningen (invited lecture);
Workshop on Systems Theory and Physics, Cortona (2 invited lectures);
Conference on Control and Information, Hong Kong (plenary lecture);
Conference on Perspectives in Systems and Control, Groningen (lecture);
Conference on Information, Signals, and Systems,  on the occasion of the 60-th birthday of Thomas Kailath, Palo Alto (invited lecture);
IFAC Conference NOLCOS, Lake Tahoe (contributed lecture);
Bernoulli Workshop on Uncertain Systems, Groningen (2 lectures);
European Control Conference (ECC'95), Rome (contributed lecture);
Pre-CDC Tutorial Workshop, New Orleans (5 lectures);
Conference on Decision and Control, New Orleans (contributed lecture).

1994

Colloquia:  University of Oldenburg; University of Rome; Scuola Normale Superiore di Pisa; Caltech (2x); University of Southern California; Bosphorus University, Istanbul (4x).
Benelux Meeting on Systems and Control (contributed lecture);
Mathematical Congress, Leiden (semi-plenary lecture);
Conference on Feedback Control, Nonlinear Systems, and Complexity  on the occasion of the 60-th birthday of George Zames, Montreal (invited lecture);
Workshop on Robust Control, Lochem (lecture);
IFAC Symposium on System Identification, Copenhagen (contributed lecture);
Advanced Study Institute on Learning and Identification (4 lectures);
Workshop on System Identification, Noordwijkerhout (lecture);
Annual Meeting of European Professors in Automatic Control (invited lecture);
Conference on Decision and Control, Orlando (2 lectures).

1993

Colloquia: University of Tilburg; University of Michigan; Washington University, St-Louis (Zaborsky lectures); Cambridge University.
Workshop on H¥, Coimbra (2 lectures);
75-th Anniversary Congress, University of Wageningen (plenary lecture);
Workshop on Systems Theory, Cortona (invited opening lecture);
European Control Conference (ECC'93), Groningen (welcome address);
11-th International Symposium on the Mathematical Theory of Networks and Systems, Regensburg (3-hour minicourse, contributed lecture);
ECC Workshop on System Identification, Louvain-la-Neuve (lecture);
Workshop on Coding, Systems Theory, and Symbolic Dynamics, Manfield, Massachusetts (invited lecture);
System Theory Days, Houston (opening lecture);
Conference on Decision and Control, San Antonio (contributed lecture).

1992

Colloquia: Scuola Normale Superiore di Pisa; IIASA, Laxenburg; ETH Zürich; University of Minnesota (3x);MIT; University of Maryland; University of Notre Dame; Rice University.
Benelux Meeting on Systems and Control (contributed lecture);
Oberwolfach Tagung on Regelungstheorie (invited lecture);
Workshop on Control of Uncertain Systems, Lochem (lecture);
IFAC Symposium NOLCOS, Bordeaux (contributed lecture);
Workshop on System Identification in Economic Systems, Vienna (invited opening lecture);
Conference on Systems, Models and Feedback  on the occasion of the 65-th birthday of Antonio Ruberti, Capri (invited opening lecture);
SIAM Conference on Control, Minneapolis (contributed lecture);
Workshop on Linear Systems, IMA, University of Minnesota (lecture);
Workshop on Distributed Parameter Systems, IMA, University of Minnesota (lecture).

1991

Colloquia: University of Illinois; Rutgers University; Carnegie-Mellon University; Royal Institute of Technology, Stockholm (4x).
Benelux Meeting on Systems and Control, Blankenberge (contributed lecture);
IIASA Workshop From Data to Model (lecture);
European Control Conference (ECC'91), Grenoble (plenary lecture);
Operations Research '91 (invited lecture);
IEEE Conference on Decision and Control, Brighton, U.K. (4 lectures).

1990

Colloquia:  NLR, Amsterdam; University of Padova (2x); Laboratoire de Signaux et Syst`emes, Gif-sur-Yvette;
Rice University; Arizona State University.
Benelux Meeting on Systems and Control (contributed lecture);
Philips Conference on Control, The Hague (invited lecture);
AIO School in Economics and Econometrics (2 invited lectures);
Symposium on Mathematical System Theory,  on the occasion of the 60-th birthday of Rudolf E. Kalman, Rome (invited lecture);
INRIA International Conference, Antibes (2 contributed lectures);
Workshop on Time-Series Analysis, IMA, University of Minnesota, Minneapolis (invited lecture);
Summer School on Modelling and Systems, Stockholm (3 invited lectures).

1989

Colloquia: Discrete Mathematics Day, Groningen; Princeton University; Rutgers University; IIASA, Laxenburg; Ex-Students Association Distinguished Lecturer, Texas Tech University; Arizona State University (2x); Brown University.
Short Course on Selected Topics in Systems Theory, Arizona State University (8 lectures);
Benelux Meeting on Systems and Control (contributed lecture);
SIAM Conference on Control in the 90s (plenary lecture);
Festcolloquium Forschunschwerpunkt Dynamische Systeme, University of Bremen (invited lecture);
Workshop on Robust Control, University of Bremen (invited opening lecture);
9-th International Symposium on the Mathematical Theory of Networks and Systems, Amsterdam (plenary opening lecture);
Workshop on The Riccati Equation in Control, Systems, and Signals, Como (lecture);
Workshop on Polynomial Methods in Linear Systems, Prague (invited opening lecture; 3 contributed lectures).

1988

Colloquia: Laboratoire des Signaux et Systèmes, Gif-sur-Yvette; Technical University of Denmark, Lyngby; Royal Institute of Technology, Stockholm (4x); Free University of Amsterdam.
INRIA Brainstorming Meeting on Control Theory, Valbonne (lecture);
EEC Workshop on Systems and Control, Lhee (lecture);
Oberwolfach Tagung on Regelungstheorie (invited lecture);
Symposium on Latent Variable Models, NIAS, Wassenaar (invited lecture);
Journ'ees de Statistique, Grenoble (invited lecture);
INRIA International Conference, Antibes (2 contributed lectures);
Summer School Modelos Para Sistemas Dinamicos, Mexico City (10 lectures);
Summer Program on Signal Processing, IMA, University of Minnesota (invited lecture);
Conference on System Identification, Leuven (invited lecture);
IMA Conference on Control Theory, Glasgow (plenary lecture);
Colloquium Signaalanalyse en Spraak, PTT, Den Haag (invited lecture);
System Theory Days, Maastricht (lecture).

1987

Colloquia: Scuola Normale Superiore di Pisa; École Nationale Superieure de Mécanique, Nantes; ETH, Zürich (2x); INRIA, Valbonne; System and Decision Sciences Day, CWI; Carnegie-Mellon University; Rice University; MIT.
Benelux Meeting on Systems and Control (contributed lecture);
Conference on Control Theory, Pisa (invited lecture);
International Workshop in Abisko (invited lecture);
EEC Workshop on Control of Uncertain Systems, Lhee (lecture);
Workshop on Road-Vehicle Systems and Related Mathematics, Torino (invited lecture);
Lecture week From Data to Model, IIASA, Laxenburg (lecture);
IFAC Congress, Münich (invited survey lecture);
Southwest Symposium on Systems & Control, Tempe, AZ (invited lecture);
IEEE Conference on Decision and Control, Los Angeles, CA (plenary lecture).

1986

Colloquia: Scuola Normale Superiore di Pisa (3x); Lund University (3x); INRIA, Valbonne.
Conference on the Research Outlook for System Theory, Como (invited lecture);
Colloque S*, CNRS, Paris (invited lecture);
INRIA International Conference, Antibes (contributed lecture);
Workshop on System Theory, Warwick (2 invited lectures);
Lecture week From Data to Model , IIASA, Laxenburg (2 lectures);
SERC Vacation School on Control, Glasgow (international guest lecturer);
Advanced Research Workshop on Modelling, Robustness and Sensitivity Reduction, Groningen (invited lecture);
IEEE Conference on Decision and Control, Athens (4 invited lectures).

1985

Colloquia: IIASA, Laxenburg (3x); Free University of Amsterdam; Universit'e de Paris Dauphine; Universit'e de Grenoble; Technical University of Vienna; Politecnico di Milano; University of Twente; Tilburg University; MIT; Harvard University; Arizona State University (2x).
Benelux Meeting on Systems and Control, Louvain-la-Neuve (contributed lecture);
Conference on Mathematical Aspects of the Road-Vehicle System, Lambrecht (invited lecture);
Conference on Mathematical Physics, Lunteren (invited lecture);
Meeting of the Contact Group on Applied Mathematics, Leuven (invited lecture);
Workshop on Operator Theory and Systems, Amsterdam (invited lecture);
7-th International Symposium on the Mathematical Theory of Networks and Systems, Stockholm (plenary lecture);
Workshop on Parametrization Problems in Systems Theory, Bremen (2 invited lectures);
IIASA Conference on the Dynamics of Macrosystems, Sopron (invited lecture);
2nd Southwest Systems and Control Workshop, Tempe, Arizona (invited lecture);
IEEE Conference on Decision and Control, Fort Lauderdale, Florida (contributed lecture).

1984

Colloquia: University of Singapore; Beijing Institute for Systems Science and Mathematics; Erasmus University, Rotterdam; Royal Institute of Technology, Stockholm; Delft University of Technology; University of Twente; ETH, Zürich; Laboratoire des Signaux et Syst`emes, Gif-sur-Yvette.
Summer Mathematics Research Institute, Canberra (4 lectures);
Benelux Meeting on Systems and Control, Lunteren (poster);
Oberwolfach Tagung on Regelungstheorie (invited lecture);
Dutch Mathematical Congress, Groningen (contributed lecture);
Beijing Conference on Systems and Control (2 invited plenary lectures);
INRIA International Conference, Nice (2 contributed lectures);
Conference on Linear Algebra and its Role in Systems Theory, Bowdoin, Maine (invited lecture);
Colloque Les Syst`emes Dynamiques: Un M'echanisme Renouvel'e, Peyresq (invited lecture);
Signal Processing Day, Groningen (invited lecture).

1983

Colloquia: University of Southern California (2x); University of California at Berkeley; Harvard University; MIT; University of Toronto; Yale University; University of Duisburg; University of Osaka (3x); Kobe University; University of Nagoya; Tokyo Institute of Technology; Tokyo University; Matsushita Electric Co., Osaka; Kyoto University (2x); University of Bremen.
CISM Seminar on Mathematical Theory of Dynamical Systems and Microphysiscs, Udine (3 invited lectures);
Convegno "Calcolo Stochastico e Sistemi Dinamici Stochastici", Padova (invited lecture).

1982

Colloquia: Bielefeld University (5x); University of Namur; University of Bremen (3x).
Benelux Meeting on Systems and Control, Lunteren (contributed lecture);
Mathematical Congress, Wageningen (semi-plenary invited lecture);
CNRS Postdoctoral Course M'ethodes de Perturbation en Automatique, Paris (3 lectures);
CISM Workshop on Singular Perturbations in Control, Udine, (2 invited lectures);
IFAC Conference on Singular Perturbations and Robustness, Ohrid, (contributed lecture);
Belgian Mathematical Congress, Antwerp (plenary closing lecture);
Bremen Workshop on System Theory (invited lecture).

1981

Colloquia: Harvard University; MIT (2x); Rutgers University; Washington University, St. Louis; University of Illinois.
Lecture series on Multivariable Design, Ankara/Bolkesjö/Delft (3 lectures);
Statistical Mechanics Day, Delft (invited lecture);
APSM Workshop on Geometry and Identification, Weston, Massachusetts (invited lecture);
Workshop on Linear and Nonlinear Feedback Theory, Bielefeld and Rome (invited opening lecture);
Second CISM Seminar on Dynamical Systems and Microphysics, Udine, Italy (2 invited lectures);
Postdoctoral Course on Multivariable Control, Groningen (5 lectures);
Curso Sobre Temas Avansados de Control Automatico, Mexico City (4 lectures);
Conference on Decision and Control, San Diego (contributed lecture; invited lecture).

1980

Colloquia: Scientific Systems Inc., Cambridge, MA; Harvard University; MIT; ETH, Zürich.
NSF Workshop on Nonlinear Circuits and Systems, Houston (invited lecture);
Rotterdam Filter Day (invited lecture);
Postdoctoral Course on Stochastic Control (5 lectures);
Oberwolfach Tagung on Regelungstheorie (2 invited overview lectures);
Geselschaft für Angewandte Mathematik und Mechanik - Jahrestagung, Berlin (plenary lecture);
Advanced Study Institute on Filtering and Identification, Les Arcs (3 lectures);
EEC Workshop on Control Theory, Edsell (invited lecture);
Fall Symposium, Dutch Mathematical Society (invited lecture);
Weekend on Algebraic System Theory, Hamburg (2 invited lectures);
Banach Semester on Optimal Control, Warsaw (2 invited lectures);
INRIA International Conference, Paris (semi-plenary invited lecture).

1979

Colloquia: Technion, Haifa; Tel Aviv University (2x); University of Namur; Mathematical Centre, Amsterdam; University of Grenoble (2x); Cambridge University; Delft University of Technology;
Lund Institute of Technology (2x); University of Hannover; ESTEC, Noordwijk.
MIT Workshop on Robustness of Control Systems (invited lecture);
Spring Vacation Course on Control (overview lecture);
Advanced Study Institute on Algebraic Methods in Linear Systems Theory (3 lectures);
CISM Seminar on Dynamical Systems and Microphysics, Udine (3 invited lectures).

1978

Colloquia:  Delft University of Technology; University of Bremen; Eindhoven University of Technology; CNR Laboratory, Padova (2x); Ben Gurion University, Beer Sheeva (3x); Weizmann Institute, Rehovot.
Oberwolfach Tagung on Regelungstheorie (invited lecture);
IFAC Congress, Helsinki (contributed lecture);
Postdoctoral Course on M'ethodes Algebriques en Automatique, Paris (3 lectures)
Conference on Stochastic Systems, Oxford (invited lecture);
Conference on Analyse des Syst`emes, Bordeaux (invited lecture);
Autumn Course on Systems Analysis, Trieste (3 lectures).

1977

Colloquia: Delft University of Technology; CNR Laboratory, Padova; University of Rome; Mathematical Centre, Amsterdam.
Workshop on Differential Games, Enschede (contributed lecture);
Oberwolfach Tagung on Applications of Measure Theory (invited lecture);
Workshop on Variable Structure Systems, Taormina (invited lecture);
Workshop on Algebraic Systems Theory, Tortola (invited lecture).

1976

Colloquia: ETH, Zürich (2x); University of Bremen; Mathematical Centre, Amsterdam.
Oberwolfach Tagung on Regelungstheorie (invited lecture);
Mathematical Congress, Amsterdam (contributed lecture).

1975

Colloquia: ETH, Zürich; University of Rome (3x); University of Florence; University of Milano; University of Toronto.
Postdoctoral Course on Functional Analysis in Control, Enschede (5 lectures);
IFAC Congress, Cambridge, Massachusetts (contributed lecture);
Post IFAC Symposium on Large Scale Systems, Wakefield (invited lecture);
Oberwolfach Tagung on Random Vibrations (invited lecture).
Summer School of the Dutch General Systems Society, Nijmegen (2 lectures).

1974

Colloquia:  University of Rome (3x); University of Padova; Control Day, Utrecht; Harvard University (3x); MIT; University of Florida.
IFAC Symposium on Stochastic Control, Budapest (contributed lecture).

1973

Colloquia: University of Florida (5x); MIT; Harvard University; University of Twente; Eindhoven University of Technology.
IFAC Symposium on Identification, Den Haag (contributed lecture).

1972

Colloquia: Yale University; University of Michigan; Harvard University; IRIA (4x); Systems Control Inc.;
University of Southern California; University of California at Berkeley; Stanford University (4x).
Workshop on Mathematical System Theory, Sanibel Island (invited lecture);
IUTAM Symposium, University of Warwick (invited lecture);
Summer School on Systems Modelling and Identification, Toulouse (5 lectures);
Joint Automatic Control Conference, Stanford (contributed lecture);
First Symposium on the Mathematical Theory of Networks and Systems, University of Maryland (invited lecture);
Conference on Decision and Control, New Orleans (invited lecture).

1971

Colloquia: University of Cambridge; University of Warwick; UMIST, Manchester; Imperial College, London (2x); University College, London; IRIA; Ècole des Mines, Fontainebleau; Brown University.

1970

Colloquia: Clarkson University; IEEE Philadelphia Chapter; Drexel Institute of Technology (2x); University of Warwick.
Cambridge Symposium on Mathematics in Control (invited lecture);
MIT Industrial Liaison Symposium on Control Theory (2 lectures).

1969

IEEE Power Meeting, Dallas, Texas (contributed lecture);
Joint Automatic Control Conference, Boulder (contributed lecture, invited lecture).

1967

Colloquia: University of Gent; Clarkson University.
Joint Automatic Control Conference, Ann Arbor (contributed lecture).

1966

Allerton Conference on Circuits and Systems (contributed lecture).
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