Organizing Committee of Fourth European Congress of Mathematics, Stockholm, June 27 -July 2, 2004

Scirentific Steering Committee of Mittag-Leffler Institute program on Mathematical Control and Systems Theory, Spring 2003

International Advisory Committee of the 34th ISCIE International Symposium on Stochastic Systems Theory and its Applications, Fukuoka, Japan, October 31 - November 1, 2002

International Advisory Committee of the Satellite Conference of ICM 2002 on Optimization and Control, Xian, China, August 30 - September1, 2002

Steering Committee of MTNS2002, University of Notre Dame, August 12-16, 2002

International Advisory Committee of the 33th ISCIE International Symposium on Stochastic Systems Theory and its Applications, Tochigi, Japan, October 29 - 30, 2001

International Scientific Committee of 2001 WSES International Conference on Speech, Signal and Image Processing, Malta, September 1 - 6, 2001

International Advisory Committee of the 32th ISCIE International Symposium on Stochastic Systems Theory and its Applications, Tottori, Japan, November 1 - 2, 2000

Member of Steering Committee of MTNS (Symposia on the Mathematical Theory of Networks and Systems), 1987--present

Program Committee for MTNS2000, Perpignan, France, June 19 - 23, 2000

IFAC Technical Committee on Stochastic Systems, 1993 -

Steering Committee of the ERCIM Working Group Control and System Theory, 1995

International Advisory Committee of the 31th ISCIE International Symposium on  Stochastic Systems Theory and its Applications, Yokohama, Japan, November 11 - 12, 1999

International Advisory Committee for the 30th ISCIE International Symposium on Stochastic Systems Theory and its Applications, Kyoto, Japan, November 4 - 6, 1998

Program Committee, 1998 International Symposium on the Mathematical Theory of Networks and Systems (MTNS98), Padova, Italy, July 6--10, 1998.

Chairman, ERNSI Workshop (European Research Network for System Identification), Stockholm, Sweden September 8 -10, 1997

Scientific Committee, Workshop on Open Problems in Mathematical Systems Theory and Control, Liege, Belgum, June 30, 1997

International Advisory Committee of the 28th ISCIE International Symposium on  Stochastic  Systems Theory and its Applications, Kyoto, Japan, November 14 - 16, 1996

Program Committee for the 1996 IEEE Conference on Decision and Control, Kobe, Japan, December 11 -13, 1996

Organizing Committee of ERCIM Workshop on Systems and Control, Budapest, Hungary, November 6 - 8, 1995

International Advisory Committee for the 27th ISCIE International Symposium on Stochastic Systems Theory and Its Applications, Beppu, Oita, Japan, October 31 - November 2, 1995

Organizing Committee of the 26th ISCIE Symposium on Stochastic Systems Theory and its Applications in Kyoto, Japan, October 26 - 28, 1994

Co-chairman, European Network for Systems Identification Workshop, Noordwijkerhout, September, 1994

Organizing Committee of the 25th ISCIE Symposium on Stochastic Systems Theory and its Applications, Osaka, Japan, November 10 - 12, 1993

Co-chairman  of Italian-Swedish Workshop in Modeling and Identification, Stockholm, Sweden, September 1992

Program Committee for MTNS-93, Regensburg, Germany, August 1993

Organizing Committee of the 24th ISCIE Symposium on Stochastic Systems Theory and its Applications, Kyoto, Japan, November 11 - 13, 1992

International Board of Advisors, Second SIAM Conference on Linear Algebra in Signals, Systems and Control, San Francisco, November 1990

International IFAC Committee for  Mathematics in Control

Organizing Committee MTNS-89, Amsterdam, The Netherlands, June 19 - 23, 1989

Organizing Committee MTNS-87, Phoenix, Arizona, June 15 - 19, 1987

Advisory Committee of SIAM Conference on Linear Algebra in Signals, Systems and Control, Boston, August 12 - 14, 1986

Chairman of Steering Committee of MTNS, 1985 - 1987

Chairman, International Symposium on the Mathematical Theory of Networks and Systems in Stockholm, June 10-14, 1985 (MTNS-85)