2022: Co-chair, Stream on Numerical Optimization Methods with Inexact Evaluations of Objective Functions and/or Derivatives, EURO 2022 Conference (Espoo, Finland, July 3-6, 2022).

2022: Organizer, Minisymposium on Regularization and Machine Learning for Image Processing (Part I, Part 2), SIAM Conference on Imaging Science 2022 (IS22) (happening virtually, March 21-25, 2022).

2022: Member of the Scientific Committee and Chair of the Organizing Committee, Workshop Due Giorni di Algebra Lineare Numerica e Applicazioni / Two Days of Numerical Linear Algebra and Applications (Naples, Italy, February 14-15, 2022).

2019: Co-organizer, Session on Optimization for Machine Learning and Big Data, 2nd IMA and OR Society Conference on Mathematics of Operational Research, (Birmingham, UK, April 25-26, 2019).

2018: Program Committee Member, Special Session on Parallel Numerical Methods and Libraries for Heterogeneous Multi/Manycores, 26th Euromicro International Conference on Parallel, Distributed and Network-Based Computing - PDP2018 (Cambridge, UK, March 21-23, 2018).

2017: Organizer, Minisymposium on First-order methods and applications (Part I, Part II, Part III), SIAM Conference on Optimization 2017 (Vancouver, British Columbia, Canada, May 22-25, 2017).

2017: Co-organizer, Special Session on Large-Scale Numerical Computations for Sustainable Energy Production and Storage, 11th International Conference on Large-Scale Scientific Computations, (Sozopol, Bulgaria, June 5-9, 2017).

2015: Technical Papers Committee Member, Supercomputing 2015 - SC15, Applications Area (Austin, Texas, USA, November 15-20, 2015).

2014: Program Committee Member, 28th IEEE International Parallel and Distributed Processing Symposium - IEEE IPDPS 2014 (Phoenix, Arizona, USA, May 19-23, 2014).

2013: Program Committee Member, 16th IEEE International Conference on Computational Science and Engineering - CSE 2013 (Sydney, December 3-5, 2013).

2012: Technical Program Committee Member, Supercomputing 2012 - SC12, Applications Track (Salt Lake City, Utah, USA, November 10-16, 2012).

2012: Program Committee Member, 15th IEEE International Conference on Computational Science and Engineering - CSE 2012, Distributed and Parallel Computing Track (Paphos, Cyprus, October 3-5, 2012).

2012: Topic Committee member, Conference Topic n. 10 - Parallel Numerical Algorithms, International Conference Euro-Par 2012 (Rhodes Island, Greece, August 27-31, 2012).

2011: Global Chair, Conference Topic n. 10 - Parallel Numerical Algorithms, and Program Committee Member, Algorithms and Programming Tools for Next-Generation High-Performance Scientific Software (HPSS 2011), International Conference Euro-Par 2011 (Bordeaux, France, August 29 - September 2, 2011).

2011: Co-organizer, Minisymposium on Preconditioning Linear Systems in Large-scale Optimization, SIAM Conference on Optimization 2011 (Darmstadt, Germany, May, 16-19, 2011).

2010: Local Chair, Conference Topic n. 10 - Parallel Numerical Algorithms, International Conference Euro-Par 2010 (Ischia, Italy, September 1-3, 2010).

2010: Co-organizer, Special Session on Parallel algorithms and software for sparse linear algebra computations, 18th Euromicro International Conference on Parallel, Distributed and Network-Based Computing - PDP2010 (Pisa, Italy, February 17-19, 2010).

2008: Co-organizer, Session on Large-scale sparse matrix computations, 5th International Workshop on Parallel Matrix Algorithms and Applications - PMAA'08 (Neuchâtel, Switzerland, June 20-22, 2008).

2007: Organizing Chair, 15th Euromicro International Conference on Parallel, Distributed and Network-Based Processing - PDP2007 (Naples, Italy, February 7-9, 2007).

2006: Scientific Program Committee Co-chair and Organizing Committee Chair, 8th Workshop of the ERCIM Working Group on Matrix Computations and Statistics (Salerno, Italy, September 2-3, 2006).

2006: Co-organizer, Minisymposium on Nonlinear Optimization and Related Numerical Linear Algebra Issues, 8th Conference of the Italian Society for Industrial and Applied Mathematics - SIMAI 2006 (Baia Samuele, RG, Italy, May 22-26, 2006).

2005: Co-organizer, Minisymposium on Numerical Linear Algebra Issues in Interior Point Methods, SIAM Conference on Optimization 2005 (Stockholm, Sweden, May, 15-19, 2005).

2004-2010: Program Committee member, International Workshop Parallel Matrix Algorithms and Applications (PMAA).

2004: Local Chair, Conference Topic 16 - Integrated Problem Solving Environments, International Conference Euro-Par 2004 (Pisa, Italy, August 31 - September 3, 2004).

2003-2010: Program Committee member, Euromicro International Conferences on Parallel, Distributed and Network-Based Processing.

2001: Co-organizer, Minisymposium on Advanced Programming Environments for Parallel and Distributed Computing, International Conference Parallel Computing 2001 - ParCo2001 (Naples, Italy, September 4-7, 2001).

1997-present: Advisory Board Committee member, International Conference Series Euro-Par.