1984-88 Member, Board of the Canadian Mathematics Society
1985-88 Member, Research Committee of the CMS
1987-88 Chair, Constitution Revision Committee of the CMS
1988-91 Member, NSERC Mathematics Grant Selection Committee
1989-91 Chairman, NSERC Mathematics Grant Selection Committee
1989-93 Member, Steering Committee Centre for Mathematical Research, Montreal
1991 Member, Committee on the Presidential Appointment, Dalhousie
1991-93 Appraisals Committee, Ontario Council on Graduate Studies
1992-96 Member, NSERC Committee on Collaborative Research Initiatives
1992-96 MAA Panel of Visiting Lecturers
1992- Member, Simon Fraser Centre for System Science
1993-2002/06 Director, Simon Fraser Centre for Experimental and Constructive Mathematics
1994-98 British Columbia Rhodes Scholarship Selection Committee
1995-98 Member, CMS Electronic Services Committee
1995-99 Member, CMS Board
1995-97 Chair, CMS Electronic Services Committee
1995 Member, NSF Scientific Computing Research Environments for the Mathematical Sciences (SCREMS) Panel, April
1995-97 Member, Mathematics Liaison Committee with NSERC
1995-96 Co-chair Executive of the Pacific Institute for the Mathematical Sciences
1996-99 Steering Committee, Simon Fraser Centre for System Science
1996 Simon Fraser member SCBC/BCHRF Health Technology Assessment competition
1996-97 HPCnet (High Performance Computing) Executive Committee
1996-99 Academy of Science, Simon Fraser Representative, Royal Society of Canada
1997, 1998 Canadian Representative, NATO Advisory Panel on Collaborative Research Grants
1997- Member, Scientific Committee, FONDAP in Applied Mathematics (FMA), CONICYT (Chilean Science Foundation)
1997-2003 Member Advisory Board for the Canada Institute for Scientific and Technical Information (CISTI) of the National Research Council of Canada
1997-98 CMS Representative to Virtuoso, Industry Canada's Virtual Centre for On-line Scholarly Publishing
1997- Canadian Computational Initiative (c3.ca) Executive Committee (1997-98); National Board (1998-2005).
1998-2000 Member, Royal Society of Canada's Public Awareness of Science Committee.
1998 Chair, NATO Advisory Panel on Collaborative Research Grants
1998-2001 Selection Committee of the Royal Society for the McNeil Medal for the Public Awareness of Science.
1998-99 Dean of Science Search Committee, Simon Fraser University.
1998-02 Member, International Mathematical Union (IMU) Executive's Committee on Electronic Information and Communication (CEIC); Deputy chair 2000-02.
1999, 2000 Member, NATO Physical Science & Engineering and Technology Panel
1999-00 President Elect Canadian Mathematical Society and CMS representative to AMS Council
1999-00 Presidential Search Committee, Simon Fraser University
April-May 2000 International Member, Review Panel, Mathematics and Statistics Department, University of Western Australia.
2000-02 President Canadian Mathematical Society; CMS representative to AMS Council and Fields Institute Board
2000- Member College of Reviewers, Canada Research Chairs (CRC) Program
2000- Founding Member, SFU Institute for Health Research and Education (IHRE)
2001-03 Chair, Advisory Board for the Canada Institute for Scientific and Technical Information (CISTI) of the National Research Council of Canada
2002-03 Past President Canadian Mathematical Society
2002-08 Chair, International Mathematical Union (IMU) Executive's Committee on Electronic Information and Communication (CEIC)
2003 Dean of Science Search Committee, Simon Fraser University.
2003-05 Member, C3.ca Association Inc's Long Range Plan Advisory Committee and Authors Panel.
2003-06 Member Board, C3.ca Association Inc.
2003-06 Member, RSofC Committee on Freedom of Scholarship and Science.
2000-05 Member, WestGrid Executive Committee, Chair 2003-04. Executive Member at Large responsible for External Relations, 2004-05.
2004-05 Chair, CMS International Affairs Committee
2004-07/01 Mathematical Association of America Board of Governors, Governor at Large representing Canadians.
2004-07/06 Member, National Killam Selection Committee.
2004-09 Associate Publisher, Books and Rich Media, Canadian Mathematical Society.
2004-07 Member, J.M. Synge Selection Committee, Royal Society of Canada.
2004-05 Member, Senate Disciplinary Committee, Dalhousie.
2004-05 Member, Math Awareness Month Committee (Math and the Cosmos), US Joint Policy Board.
2004-2008 Member, Scientific Directorate, Atlantic Computational Excellence Network, ACEnet.
2005-06 Vice-Chair, Executive, C3.ca Association Inc. Interim Chair, March-May 2006.
2005- Advisory Board, International Centre for Excellence in Mathematical Education, Melbourne, Australia.
2005-2008 Member, Scientific Committee on Information Science Technologies, Europe-Canada, (IST-EC2) Scientific Committee.
2005-2008 Member Board of Trustees, World Mathematical Knowledge Management Interest Group.
2006-2007 Director, Atlantic Association for Research in the Mathematical Sciences (AARMS) (Starting Dec 1, 2005)
2006-2008 Member, Selection Committee, Canadian
Science and Engineering Hall of Fame,
2006-2009 Member, AMS Library Committee.
2006- Member, National Advisory Board of ``Virtual Researcher on Call'' (VROC).
2006-2009 Member, MAA Shortcourse Committee.
March 2006 Leader, Review Team, Mathematics Review, University of the West Indies, Mona Campus, Kingston Jamaica.
2006-07 Chair, Executive, C3.ca Association Inc.
2006-07 Member, Robbins Prize Committee, AMS.
2007-09 Member at Large, Academy III Council, RSC.
2007-08 Co-chair, AMS Library Committee.
2008 Member, University of Newcastle, ICT Review Committee.
2008-10 Member, SASTRA Ramanujan Prize selection Committee.
2009- Director, Centre for Computer-assisted Mathematical Research and Applications (CARMA), Priority Research Centre, University of Newcastle.
2009-2011 Member, Strategy and Services sub-committee of Intersect: eResearch support and innovation for NSW.
2009-2011 Member, University of Newcastle Advisory Group to Review Academic Research Computing (ARC) Group.
2009- Member, Executive of ANZIAM, and President ANZIAM Optimization Special Interest Group (SIGMAopt).
2009-2012 Ordinary Member, Council of the of Australian Mathematical Society.
2010- Chair, Australian Mathematical Sciences Institute (AMSI) Scientific Advisory Committee.
2010 Member, Research Evaluation Committee (MIC), Excellence in Research for Australia (ERA-10).
2011-12 Co-chair, AMS Library Committee.
2011-15 Chair, Christopher Heyde Medal and A K Head Travelling Scholarship Selection Committee, Australian Academy of Science.
2012 Member, Research Evaluation Committee (MIC), Excellence in Research for Australia (ERA-12).
2012-- Member, Research Centres Subcommittee, Mathematical Sciences Decadal Plan.
2014--16 Incoming Chair, 2014 and Chair 2015, Gavin Brown Prize Committee of the Australian Mathematical Society.