• Mathematical Colloquium, October 17, 2013, University of Bayreuth, Germany.
• Plenary lecture at 19th Conference of the International Linear Algebra Society (ILAS), August 6-9, 2014, Suwon, South Korea.

• Member of the scientific committee of the Joint ALAMA-ANLA Workshop, July 14-16, 2014, Barcelona, Spain.
• Co-Organizer (with Gitta Kutyniok) of the joint GAMM ANLA-MSIP Workshop Matrix Computations for Sparse Recovery, April 9-11, 2014, TU Berlin (Germany).
• Co-Organizer (with Martin Heß, Judith Schneider) of the workshop Model Reduction for Complex Dynamical Systems (MODRED 2013), December 11-13, 2013, Max Planck Institute Magdeburg (Germany).
• Co-organizer (with Heike Faßbender, Lars Grasedyck, Daniel Kressner) of the 5th Workshop on Matrix Equations and Tensor Techniques, October 10-11, 2013, EPF Lausanne (Switzerland).
• Member of the scientific committee of the ENUMATH 2013, August 26-30, 2013, EPFL Lausanne, Switzerland.

• Member of the organizing committee of the European Conference on Computational Optimization (EUCCO), July 17-19, 2013, Chemnitz, Germany.

• Co-organizer (with Albert Cohen, Mario Ohlberger, Karen Willcox) of the CIRM workshop Model Reduction and Approximation for Complex Systems, June 10-14, 2013, CIRM Luminy, France.

• Co-organizer (with Wolfgang Hackbusch) of the GAMM Seminar Numerical Methods for Uncertainty Quantification, January 21-23, 2013, MPI for Mathematics in the Sciences Leipzig, Germany.

• Member of the organizing and scientific committees of the CIRM workshop Structured Matrix Computations in Non Euclidean Geometries: Algorithms and Applications, October 8-12, 2012, CIRM Luminy, France.

• Member of the executive and scientific committees for the Second International Workshop on Model Reduction for Parametrized Systems (MoRePaS II), October 2-5, 2012, Schloss Reisensburg, Günzburg, Germany.

• Member of the Scientific Committee for the SIAM Conference on Applied Linear Algebra (LA12), June 18-22, 2012, Valencia, Spain.

• Workshop on Matrix Equations and Tensor Techniques, November 21-22, 2011, RWTH Aachen, Germany.

• Summer School on Numerical Linear Algebra for Dynamical and High-Dimensional Problems, October 10-15, 2011, Trogir, Croatia.
  Lectures (slides) and exercises are online!

• Member of the scientific committee of the 2nd summer school of the IMPRS Magdeburg: Large Scale Networks in Engineering and Life Sciences September 26-30, 2011, Max Planck Institute Magdeburg, Germany.

• Co-organizer of the Workshop of the GAMM Activity Group Applied and Numerical Linear Algebra with special topic "Model Reduction", September 22-23 2011, University of Bremen, Germany.

• Member of the local organizing committee of the 17th Conference of the International Linear Algebra Society, August 22-26, 2011, Braunschweig, Germany.
• Co-organizer of the minisymposia Numerical Linear Algebra Beyond Linear Systems and Eigenvalues (2 parts, with Michele Benzi), and Structure-Preserving Model Reduction (3 parts, with Athanasios C. Antoulas).

• Co-organizer of the 1-day Symposium on "Eigenvalues, Model Order Reduction and Trust Regions" in celebration of Danny Sorensen's 65th birthday, June 11, 2011, Silver Legacy Resort, Reno, NV, USA.

• Member of the scientific committee of the 1. Max Planck Industrial Workshop, May 6, 2011, Max Planck Institute Magdeburg, Germany.

• Co-organizer of the Workshop on Model Order Reduction in Optimization and Control with PDEs (MOR 2011), January 26-28, 2011, Weierstrass Institute for Applied Analysis and Stochastics, Berlin, Germany.

A short overview of the SyreNe project can be found in the ECMI Newsletter 45, March 2009.

A dissemination workshop Model Reduction for Complex Dynamical Systems took place at TU Berlin, December 2-3, 2010.
The slides of the talks are online!

A dissemination minisymposium was organized at ECMI 2010.

A short description The GAMM Activity Group Applied and Numerical Linear Algebra can be found in IMAGE (Bulletin of the ILAS), Vol. 43, pp. 25-26, 2009.

• Guest editor of BIT Numerical Mathematics, special issue related to CIRM workshop Structured Matrix Computations in Non Euclidean Geometries: Algorithms and Applications, October 8-12, 2012, CIRM Luminy, France. Deadline was February 28, 2013!
• LINEAR ALGEBRA AND ITS APPLICATIONS
  Volume 436, Issue 8, pp. 2717-2962 (15 April 2012)
  Special issue dedicated to Danny C. Sorensen's 65th birthday.
  Edited by Peter Benner, Mark Embree, C.T. Kelley and Richard B. Lehoucq.
  Preface.

• Model Reduction for Circuit Simulation. (Proceedings of a workshop held at University of Hamburg, October 30-31, 2008.)
  Edited by Peter Benner, Michael Hinze und Jan ter Maten.
  Lecture Notes in Electrical Engineering, Vol. 74, Springer-Verlag, Berlin/Heidelberg, 2011.
• Special issue of NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS on Large-Scale Matrix Equations of Special Type, vol. 15, no. 9, pp. 747-886, November 2008.
  More info: contents, BibTeX entries.
• LINEAR ALGEBRA AND ITS APPLICATIONS
  Volume 415, Issues 2-3, Pages 231-578 (1 June 2006)
  Special Issue on Order Reduction of Large-Scale Systems
  Edited by Peter Benner, Roland W. Freund, Danny C. Sorensen and Andras Varga
  Preface,   BibTeX entries for the issue and individual articles.
   
• Dimension Reduction of Large-Scale Systems
  edited by Peter Benner, Volker Mehrmann, and Danny C. Sorensen.
  Lecture Notes in Computational Science and Engineering, Vol. 45, Springer-Verlag, Berlin/Heidelberg, June 2005, xii+395 p., ISBN: 3-540-24545-6.
  More info (preface, table of contents, etc.)
  BibTeX entries for the book and the individual chapters.
   
• 2003-2008: Member of the editorial board of SIAM book series Fundamentals of Algorithms
• 2004-2010: Member of the editorial board of Computing Letters