Associate Editor, IEEE Transactions on Parallel and Distributed Systems, (2004-2007)
Editorial Advisory Board, Scientific Programming
Program Committee, P2S2 2013
Program Committee, EuroMPI 2013
Program Committee, ICS 2013
Technical Program Chair, SC12
Steering Committee, DISCS Workshop
Program Committee, EuroMPI 2012
Program Committee, ICPP 2012
Program Committee, P2S2 2012
Program Committee, ISPA 2012
Tutorials Committee, ISC'12
Program Committee, CCGrid 2012
Technical Papers Co-Chair, SC11
Program Committee, IISWC 2011
Program Committee, Cluster 2011
Program Committee, ICPP 2011
Program Committee, P2S2 2011
Program Committee, EuroMPI 2011
Tutorials Committee, ISC'11
Program Committee, ICS 2011
Program Committee, SNAPI 2011
Program Committee, CCGrid2011
Program Vice-Chair for communication networks, HiPC 2010
System Software Area Co-Chair for Technical Papers, SC10
Program Committee, ICPP 2010
Program Committee, P2S2 2010
Program Committee, EuroMPI 2010
Program Committee, NAS 2010
Program Committee, PADTAD 2010
Program Committee, ICS 2010
Program Committee, SNAPI 2010
Co-Chair, Student Research Symposium, HiPC 2009
Program Committee, SC09
Tutorials Co-Chair, SC09
Program Committee, PGAS 2009
Program Committee, Cluster 2009
Program Committee, Euro PVM/MPI 2009
Program Committee, ICPP 2009
Program Committee, P2S2 2009
Program Committee, PADTAD 2009
Co-Chair, Student Research Symposium, HiPC 2008
Program Committee, SC08
Program Committee, ICPADS 2008
Program Committee, P2S2 2008
Program Committee, ICPP 2008
Program Committee, ACSAC 2008
Poster/Presentation Chair, HiPC '07
Program Committee, IISWC 2007
Program Committee, Cluster 2007
Program Committee, ACSAC 2007
Program Committee, SMTPS Workshop at IPDPS 2007
Poster/Presentation Chair, HiPC '06
Program Committee, ICPADS 2006
Program Committee, Eleventh Asia-Pacific Computer Systems Architecture Conference (ACSAC 2006)
Program Committee, SMTPS Workshop at IPDPS 2006
Poster/Presentation Chair, HiPC '05
Program Committee, Tenth Asia-Pacific Computer Systems Architecture Conference (ACSAC'2005)
Program Committee, SMTPS Workshop at IPDPS 2005
Program Committee, Cluster 2004
Program Committee, Ninth Asia-Pacific Computer Systems Architecture Conference (ACSAC'2004)
Program Committee, ICPP 2004
Program Committee, Cluster 2003
Program Committee, Workshop on Parallel I/O in Cluster Computing and Computational Grids at CCGrid 2003
Vice Program Chair, Cluster 2002
Editorial Board of a Special Issue of Calculateurs Paralleles on Parallel I/O for Cluster Computing, 2001
Program Committee, CCGrid2001
Global Chair, Parallel I/O and Storage Technology, Euro-Par 2000
BOFs (Birds-of-a-Feather sessions) Chair, SC2000
Proposal Review Panels at the National Science Foundation, 1999
General Co-Chair, IOPADS '99
Program Committee, HiPC '99
Program Committee, Heterogeneous Computing Workshop at IPPS '99
Vice-Chair, Parallel I/O Workshop at Euro-Par '98
Program Committee, PDCS-98
Poster Exhibits Chair, SC98
Co-Guest Editor, Special Issue of IJHPCA on I/O in Parallel Applications
Tutorials Vice-Chair, SC97
Program Committee, HiPC '97
Publicity Chair, IOPADS '97
Tutorials Vice-Chair, Supercomputing '96
Ph.D. thesis committees of Rakesh Krishnaiyer (1998), Chutimet Srinilta (1998), and Jaechun No (1999) at Syracuse University; Murali Vilayannur at Penn State University (2005); Sachin More (2000), Avery Ching (2007), Kenin Coloma (2007), and Arifa Nisar (2010) at Northwestern University; Yawei Li (2008) at Illinois Institute of Technology; Saba Sehrish (2010) at University of Central Florida