Professional Service
   Alex served as the Founding Chair, during 2018-2020, of the
   SIAM Activity Group on Applied and Computational Discrete Algorithms.

Editor
   Alex serves / has served on the editorial boards of:
   SIAM Journal on Scientific Computing
   SIAM Classics in Applied Mathematics book series
   SIAM Fundamentals of Algorithms book series
   Journal of the ACM (Scientific and High Performance Computing )
   Optimization Methods and Software
   SIAM Review
   SIAM Books
   SIAM Series in Computational Science and Engineering
   Electronic Transactions on Numerical Analysis
   International Journal on Computational Science and Engineering

   Committees:
   SIAM Committee on Science Policy (2021-).
   SIAM Committee on Activity Groups (2022-).
   SIAM Fellows Selection Committee (2019-2021).
   SIAM Fellows Canvassing Committee
   Chair of the George Polya Prize in Applied Combinatorics 2016, SIAM
   SIAM Committee on Appointments and Committees


Recent Conferences
   Alex has served on the following Recent Program Committees:
   SEA 2022 - 20th Sympoisum on Experimental Agorithms Heidelberg, July 25-27, 2022. He also chaired the best paper selection committee for this Symposium.
   First SIAM Conference on Applied and Computational Discrete Algorithms July 2021
   Purdue Conference on Scientific Computing and Approximation
      West Lafayette, March 2018
   IPDPS 2018, Algorithms Track
      Vancouver, May 2018
   IPDPS 2017, High Performance Computational Biology Workshop, Chair
      Orlando, May 2017
   IPDPS 2016, Parallel Computing and Optimization Workshop
      Chicago, May 2016
   IPDPS 2016, High Performance Computational Biology Workshop
      Chicago, May 2016
   Supercomputing (SC15)
      Austin, Nov. 2015
   Supercomputing (SC13)
      (Algorithms Track Chair) Denver, Nov. 2013
   Supercomputing (SC12)
      Salt Lake City, Nov. 2012
   Supercomputing (SC10)
      New Orleans, Nov. 15-18, 2010
   ACM Symposium on Parallel Algorithms and Architectures (SPAA)
      Santorini, Greece, June 13-15, 2010
   SIAM Conference on Computational Science and Engineering 2009
   Fourth International Symposium on Bioinformatics Research and Applications
      Atlanta, GA May 6-8, 2008
   SIAM Workshop on Combinatorial Scientific Computing (CSC07, Co-chair)
   2007 International Conference on Parallel and Distributed Processing (IPDPS)
   International Conference on High Performance Computing
      Bangalore, India, Dec. 18-21, 2006
   2007 International Symposium on Bioinformatics Research and Applications
      Atlanta, GA, May 6-9, 2007