• Editorial Board Member of SIAM Journal on Matrix Analysis and its Applications.
  
  
• Editorial Board Member of Calcolo (Springer Verlag).
  
  
• Member of the PaperHive Advisory Board.
  Also see the PaperHive Conversation (published September 26, 2016).
  
  
• Society Memberships: GAMM, ILAS, SIAM.
  
  
  

Committes and Societies (selection):

• Chair of the SIAM Committee on Gene Golub Summer School.

• Chair of the GAMM Activity Group Applied and Numerical Linear Algebra.
  
  
• Co-Founder and Scientific Committee Member of the E-NLA Online Series on Numerical Linear Algebra.
  
  
• Member of the SIAM Education Committee.
  
  

Conference Activities (selection):

• Co-Organizer of the (online) minisymposium History of Linear Algebra (link to YouTube) at ILAS 2022.
  
  
• Co-Organizer of the Gene Golub SIAM Summer School 2017 in Berlin from May 29 to June 9, 2017.
  Article in SIAM News, September 2017.
  
  
• Co-Organizer of the conference Numerical Algebra, Matrix Theory, Differential-Algebraic Equations, and Control Theory in honor of Volker Mehrmann on the occasion of his 60th birthday (Berlin, May 2015).
  
  
• Co-Organizer of the 15th Berlin Mathematical Day, May 8, 2010, at TU Berlin.
  
  
• Co-Organizer of the Grassmann Bicentennial Conference, September 16-19, 2009, Potsdam, Germany and Szczecin, Poland.
  In November 2010 this conference was awarded the 2010 Potsdam Conference Award (Potsdamer Konferenzpreis) in the category Innovative and/or exceptional events.
  
  
• Member of the Local Organizing Committee of the Householder Symposium XVII, June 1-6, 2008, Zeuthen, Germany.
  
  
• Co-organizer of Gene Golub Day, February 29, 2008, at TU Berlin.
  
  

Journals and Other Publications (selection):

• Co-Editor of the GAMM Mitteilungen Special Issue Applied and Numerical Linear Algebra (vol. 43, issues 3 and 4, 2020).
  
  
• Co-Editor of the ScienceOpen Poster Collection Numerical Algebra, Matrix Theory, Differential-Algebraic Equations, and Control Theory.
  
  
• Associate Editor of the Special Issue on Matrix Functions of Linear Algebra and its Applications. Preface (published online, March 2014).
  
  
• Managing Editor of Electronic Transactions on Numerical Analysis.
  
  

Other Activities (selection):

• Co-Head of Project C29, DFG Research Center MATHEON,
  Numerical methods for large-scale parameter-dependent systems.
  
  
• Co-Head of Project B17, DFG Research Center MATHEON,
  Improvement of the linear algebra kernel of Simplex-based LP- and MIP-solvers.
  
  
• Heisenberg-Professor (DFG's description of the Heisenberg Program).
  
  
• Head of an Emmy Noether Junior Research Group (DFG's description of the Emmy Noether Program).
  
  

''... in the arrogance of youth, I thought that linear algebra was for boys and girls and that real men and women worked in functional analysis. However, this is but one of many opinions that did not stand the test of time.''
(Harry Dym, author of Linear Algebra in Action, AMS, 2007).