**Since 2000.**

World Conference of Nonlinear Analysis-2000, Catania, Italy, July 19-26, 2000, invited speaker, Special session on evolution equations and optimal control.

(with J.-M. Buchot) International Conference on Nonlinear Problems in Aviation and Aerospace, Daytona Beach, Florida, USA, May 10-12, 2000, Invited speaker.

(with P. A. Nguyen) 14th International Symposium on Mathematical Theory of Networks and Systems, June 19-23, 2000.

Optimale Steuerung komplexer dynamischer Strukturen, Oberwolfach, June 4-10, 2000, invited speaker.

(with M. Mezghani and F. Roggero) 7th European Conference on the Mathematics of Oil Recovery, Baveno, Italy, September 2000.

Joint Meeting on Applied Mathematics, Indian Institute of Science and Toulouse University Network, Bangalore, December 4-6, 2000, invited plenary speaker.

SIAM Control Conference, July 12-14, 2001, San Diego, California, invited speaker.in the minisymposium Control Theory for Interactive PDE structures (organized by I. Lasiecka and G. Avalos), and in the minisymposium Numerical Analysis for PDE Control (organized by F. Tröltzsch and E. Casas).

Conference on Control of Distributed Parameter Systems, Graz, July 15-21, 2001, Organizing Committee : Wolfgang Desch, Franz Kappel, Karl Kunisch, invited plenary speaker.

SMAI 2001, Pompadour, May 2001, invited speaker in the minisymposium ‘Contrôle’ (organized by J.-P. Puel).

PICOF 2002, Carthage, 10-12 April 2002, invited plenary speaker.

Satellite conference of AMAM 2003, ‘Control and Optimization’, Nice, February 14, 2003, organized by C. Fabre, A. Habbal, Rousselet, invited plenary speaker.

French-Indian cyber workshop, Toulouse-Bangalore, February 3-6, 2003, invited plenary speaker.

‘New challenges in Applied Mathematics’, September 1-5, 2003, Castro Urdiales, Spain, organized by Casas, Fernandez-Cara, Zuazua, invited plenary speaker.

ICIAM 2003, invited speaker in the minisymposium ‘Optimization with partial differential equations’, organized par M. Hintermuller et M. Hinze.

Research Group on ‘Contrôle des décollements’ (GdR CNRS), Toulouse, September 18, 2003, conférencier plénier invité.

Workshop on Control, Set-Valued Analysis and Applications, Pointe-à-Pitre, April 5-8, 2004, invited plenary speaker.

Premier Congrés de Mathématiques Canada – France (First French-Canadian Conference in Mathematics), Toulouse, July 12-15, 2004, invited speaker in the minisymposium ‘Control and Differential Equations’ organized by F. H. Clarke and R. Stern.

Journée ‘Contrôle et contrôlabilité, Lille, December 10, 2004, Université Lille I, invited plenary speaker.

Control Theory and PDE’s, Istituto Nazionale di Alta Matematica, Roma, March 30 – April 1st, 2005, organized by P. Cannarsa and B. Piccoli, invited plenary speaker.

‘Optimal control of coupled systems of PDE’, Oberwolfach, April 17-23, 2005, organized by K. Kunisch, G. Leugeuring, J. Sprekels, F. Tröltzsch, invited speaker.

‘Colloque Equations aux dérivées partielles non linéaires’, Tipaza, 23-26 Mai 2005, organized by A. Mokrane and F. Murat, invited plenary speaker.

22nd IFIP TC 7 Conference on System Modeling and Optimization, Torino, July 18-22, 2005, invited plenary speaker in the minisymposium ‘Control and Differential Equations’ organized by G. Avalos, F. Bucci.

Workshop on PDE Constrained Optimization, Tomar, Portugal, July 26-29, 2005, invited speaker in the minisymposium ‘Approximation of PDE Constrained Optimization’ organized by E. Casas.

Workshop on Inverse Problems and Dynamical Systems, Roma, March 2006, invited plenary speaker.

Invited speaker in the session ‘Control of dynamical systems’ of the 8th French-Romanian Conference in applied mathematics, Chambéry, August 28 – September 1, 2006.

6th International Congress on Industrial and Applied Mathematics (ICIAM), Zurich, July 16-20, 2007, invited plenary speaker in the minisymposium organized by P. Cannarsa and J. Vancostenoble.

International workshop on Analysis and Control of Partial Differential Equations, (ANCPDE07), June 25-29, 2007, Pont à Mousson, for the 60^{th} birthday of J.-P. Puel.

Conference ’10 years of research in LAMSIN’, December 13-15, 2007, Tunis, invited plenary speaker.

Optimal control of coupled systems of PDE, MFO Oberwolfach, March 2-8, 2008, organized by K. Kunisch, G. Leugering, J. Sprekels, F. Tröltzsch, invited plenary speaker.

Control of Physical Systems and partial Differential Equations, June 16-20, 2008, Institut Henri Poincaré, Paris, organized by J.-M. Coron, J.-P. Puel, G. Turinici, invited plenary speaker.

Invited speaker. for a 45mn-talk in the « Fifth World Congress of Nonlinear Analysts » (WCNA-2008), Orlando, Florida, July 2-9, 2008.

50 Years of optimal control, September 15-20, 2008, Bedlewo, Poland, organized by A. Ioffe, K. Malanowski, F. Tröltzsch, invited plenary speaker.

International Conference on Approximation Methods and Numerical Modeling in Environment and Natural Resources, June 8-11, 2009, Pau – France, invited speaker in the minisymposium ‘Some Inverse Problems and Their Applications’.

International Conference on Mathematical Control Theory, ‘Academy of Mathematics and Systems Sciences of the Chinese Academy of Sciences in Beijing, China May 15-17, 2009, invited plenary speaker.

Partial differential equations, optimum design and numerics, 23 Août – 4 Septembre 2009, Benasque, invited plenary speaker.

Workshop ‘Control and Inverse Problems of Systems Governed by PDEs », Sevilla, 28-30 Septembre 2009. invited plenary speaker.

International Conference on Control and Inverse Problems, 16-18 Décembre 2009, Bangalore, invited plenary speaker.

Conference of the European Research Group project ‘Control of Partial Differential Equations’, CIRM Luminy, 25-29 Janvier 2010. invited plenary speaker.

Oberwolfach workshop, ‘New Directions in Simulation, Control and Analysis for Interfaces and Free Boundaries’, organized by C. Elliott, Y. Giga, M. Hinze, and V. Styles, January 31 – February 6, 2010. invited speaker.

6th Variational Multi-Scale Workshop, Pau, May 27-28, 2010, invited plenary speaker.

Workshop ‘Control and inverse problems for PDE’, Besançon, 14-17 juin 2010, invited plenary speaker.

**I****CM satellite conference** in Partial differential equation and related topics, TIFR-CAM, Bangalore, Inde, 13-17 August, 2010, invited plenary speaker.

International Workshop in Fluid-Structure Interaction Problems, Foz do Arelho, Portugal, September 6-8, 2010, invited plenary speaker.

Workshop on ‘Control of parabolic systems and fluid equations’, November 15 – 19, 2010, IHP, invited plenary speaker.

Conference ‘New Trends in Analysis and Control of Nonlinear PDEs’, Roma, INdAM, June 13 – 15, 2011, organized by P. Cannarsa and F. Ancona. invited plenary speaker.

ICIAM 2011, July 18-22, Vancouver, invited speaker in the minisymposium ‘Nonlinear Aspects in Optimal control’, organized by Roland Herzog.

ICIAM 2011, July 18-22, Vancouver, invited speaker in the mini-symposium thématique ‘Mathematical Fluid Dynamics’, by Andrei Fursikov.

Workshop on Control and Optimization of PDEs, Graz (at the Bildungshaus Mariatrost, http://www.mariatrost.at on October 10 – 14, 2011, organized by K. Kunisch, K. Bredies, C. Clason, G. von Winckel, invited plenary speaker.

Workshop on Optimal Control of Partial Differential Equations, Wasserschloss Klaffenbach (Germany), November 28 – December 2, 2011, organized by Karsten Eppler, Roland Herzog, Christian Meyer, et Arnd Roesch, invited plenary speaker.

Contrôle, Imagerie et Probabilités en Méditerranée, CIPM 2011, Université de Nice Sophia Antipolis, du 24 au 28 octobre 2011, invited plenary speaker.

Congrès du LIA CNRS Formath Vietnam, 23, 24 & 25 novembre 2011, Université de Paris 13, invited plenary speaker.

Conference on Nonlinear Functional Analysis, IMSc, Chennai, January 18-20, 2012, A *conference* in honour of Prof S. *Kesavan* on completing 60 years, invited plenary speaker.

5th International Conference on High Performance Scientific Computing, Modeling, Simulation and Optimization of Complex Processes March 5-9, 2012 – Hanoi, Vietnam, invited speaker in the mini-symposium ‘Optimal Control of PDEs – Methods and Applications’, organized by Fredi Tröltzsch.

Differential Equations, Inverse Problems and Control Theory, Cortona, Italy, June 17 to June 21, 2013, invited plenary speaker, Workshop organized by Angelo Favini, Alfredo Lorenzi.

Control of Distributed Parameter Systems, 1-5 July 2013, Craiova, Roumanie, invited plenary speaker, http://www.math.ucv.ro/wcdps/index.html

SIAM Conference on Control and its Applications, July 8-10, 2013, San Diego, California, invited speaker for the SIAG/CST Best SICON Paper Prize 2011.

Mathematical Aspects of Fluid-Structure Interaction Problems, Institut Henri Poincaré, Paris, November 4-8, 2013, invited plenary speaker.

Mathematical Control in Trieste, December 2nd-6th, 2013, SISSA, Trieste, Italy, invited plenary speaker, http://mct.lsis.org

Control of PDEs, March 31, April 4, 2014, CNAM, Paris, invited plenary speaker.

http://controlpde2014.cnam.fr/

Controllability and Netwoks, May 26-28, 2014, Roma, invited plenary speaker.

Indo-European Workshop on Current Research on the Finite Element Methods, July 6-17, 2015, IIT Bombay, organized by N. Nataraj, S. Brenner, O. Pironneau, invited to give a course.