- 2014MemberCardiac Electrophysiology and Arrhythmias/Regulation Peer Review Study Group, American Heart Association 
- 2009Session ChairScientific Meeting, Featured Symposium-New Concepts, Heart Rhythm Society (formerly NASPE) 
- 2009Session ChairCardioRhythm Highlight 
- 2008 - 2012Subcommittee MemberFellowship, Heart Rhythm Society (formerly NASPE) 
- 2008 - 2012Charter MemberElectrical Signaling, Ion Transport, and Arrhythmia Study Section, National Institutes of Health 
- 2008ChairCardiac Electrophysiology and Arrhythmias/Regulation Peer Review Study Group, American Heart Association 
- 2007Session ChairNorth American Society of Pacing and Electrophysiology 
- 2007Co-ChairCardiac Electrophysiology and Arrhythmias/Regulation Peer Review Study Group, American Heart Association 
- 2006Temporary MemberElectrical Signaling, Ion Transport, and Arrhythmia Study Section, National Institutes of Health 
- 2006 - presentMemberResearch Committee, Division of Cardiovascular Diseases, Department of Internal Medicine 
- 2005Special ReviewerProgram Project Grants, National Institutes of Health 
- 2005 - presentFacultyProgram on Aging, Division of Cardiovascular Diseases, Department of Internal Medicine 
- 2004Session ChairNorth American Society of Pacing and Electrophysiology 
- 2004MemberReview Panel on Progression of Cardiovascular Disease in Type 1 Diabetes, National Institutes of Health 
- 2003Session ChairNorth American Society of Pacing and Electrophysiology 
- 2003Temporary MemberRenal and Cardiovascular Study Section, National Institutes of Health 
- 2002 - presentMemberHeart Rhythm Society (formerly NASPE) 
- 1998 - 2001Grant ReviewerNora Eccles Treadwell Foundation 
- 1997Special ReviewerCardiovascular Study Section, National Institutes of Health 
- 1997Ad Hoc ReviewerMerit Review Cardiovascular Board, Veteran's Administration, U.S. Department of Veterans Affairs 
- 1997MemberMerit Review Cardiovascular Board, Veteran's Administration, U.S. Department of Veterans Affairs 
- 1995 - 1996ChairAffiliate Study Section Group B, American Heart Association 
- 1995MemberCardiovascular Division, Department of Internal Medicine, Carver College of Medicine 
- 1995MemberCardiac Electrophysiology Search Committee, Cardiovascular Division, Department of Internal Medicine 
- 1994 - 1996MemberAffiliate Study Section Group B, American Heart Association 
- 1994 - 1995Vice ChairAffiliate Study Section Group B, American Heart Association 
- 1994MemberPromotion Committee, Department of Internal Medicine, Carver College of Medicine 
- 1994 - presentMemberCentral Society for Clinical Research 
- 1993Special ReviewerCardiovascular Study Section, National Institutes of Health 
- 1993 - presentMemberCardiovascular Study Section, National Institutes of Health 
- 1992 - 1994MemberGreat Plains Regional Peer Review Consortium, American Heart Association 
- 1992 - presentReviewerScientific Meeting Abstracts, American Heart Association 
- 1992 - presentMemberScientific Meeting Abstracts, American Heart Association 
- 1990 - 1995MemberResearch Committee, Iowa Affiliate, American Heart Association 
- 1990 - 1995MemberIowa Affiliate, American Heart Association 
- 1990 - presentReviewerMerit Review Awards, Veteran's Administration, U.S. Department of Veterans Affairs 
- 1990 - presentReviewerAffiliate Fellowship Application, American Heart Association 
- 1990 - presentMemberAmerican Federation for Clinical Research 
- 1990 - presentMemberMerit Review Awards, Veteran's Administration, U.S. Department of Veterans Affairs 
- 1990 - presentMemberAffiliate Fellowship Application, American Heart Association 
- 1988 - presentMemberBiophysical Society 
- 1988 - presentMemberSociety of General Physiologists 
- 1987 - presentFellowAmerican Heart Association 
- 1987 - presentFellowCouncil on Clinical Cardiology, American Heart Association 
- 1987 - presentFellowAmerican College of Cardiology 
- 1987 - presentMemberAmerican Medical Association 
- 1987 - presentMemberAmerican Heart Association 
- 1987 - presentMemberCouncil on Clinical Cardiology, American Heart Association 
- 1987 - presentMemberCouncil on Basic Science, American Heart Association 
- 1987 - presentMemberAmerican College of Cardiology 
- 1986 - presentMemberCardiac Electrophysiology Society 
- 1985 - presentFellowAmerican College of Physicians 
- 1985 - presentMemberAmerican College of Physicians