Professional Societies
American Institute for Medical and Biological Engineering,1992-
      Fellows Selection Committee, 1993
      Board of Directors, 2002 - 2005
      Chair, College of Fellows, 2003 -2004
American Society for Clinical Investigation, 1987-
American Society of Mechanical Engineers, 1986-
      Technical Editor, Journal of Biomechanical Engineering, 2002-2007
      Fellow, 2002 -
American Physiological Society, 1981-
     Program Advisory Committee, 1993-95
     Fellow, 1989
     Steering Committee, 1989-95
     Cardiac Mechanics Subsection Representative, 1991 to 1995
American Federation for Clinical Research, 1980
American Heart Association: Councils on Basic Science and Circulation, 1978-
Biomedical Engineering Society, 1981
     Board of Directors, 2001 -
     President, 2005 - 2006
     2008 Annual Meetings Chairman
Biophysical Society, 1982
Cardiovascular Systems Dynamics Society, 1984-
International Society for Heart Research, 1984-
St. Jude Medical, Inc., St. Paul, MN
     Board of Directors, 2001- 2006
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