- 2013PresidentBoard of Directors, Society of Atherosclerosis Imaging 
- 2013Co-ChairStructural Heart Disease/Cardiovascular Imaging Research Committee 
- 2013Co-ChairMultimodality Imaging Task Force, Integrated Cardiovascular Imaging Group/Center 
- 2011President-ElectBoard of Directors, Society of Atherosclerosis Imaging 
- 2011MemberACCF/AHA/ACP/AATS/PCNA/SCAI/STS Writing Committee Guidline for the Diagnosis and Management of Patients With Stable Ischemic Heart Disease 
- 2011MemberAMA/PCPI/ACC/AHA/ACR/NCQA Cardiac Imaging Performance Measure Work Group, American Medical Association 
- 2011 - 2014Co-ChairWriting Committee: Approaches to Enhancing Radiation Safety in Cardiac Imaging, American Heart Association 
- 2011 - 2013MemberWriting Committee: Role of Noninvasive Testing in the Clinical Evaluation of Women with Suspected Coronary Artery Disease, American Heart Association 
- 2011MemberDuke Cardiovascular Research Institute-ACC-AHA Think Tank, American College of Cardiology 
- 2011 - presentElected FellowSociety of Cardiovascular Computed Tomography 
- 2011MemberSteering Committee, Duke Cardiovascular Research Institute-ACC-AHA Think Tank, American College of Cardiology 
- 2010 - 2012MemberWriting Committee: Exercise Standards for Testing and Training: A Statement for Healthcare Professionals From the AHA, American Heart Association 
- 2010 - 2013MemberBasic Sciences Committee, Society of Cardiovascular Computed Tomography 
- 2010 - presentMemberMayo Clinic, Maintenance of Certification Advisory Group 
- 2009MemberProgram Committee, Council on Clinical Cardiology, American Heart Association 
- 2009MemberMayo Clinic, Administrative Committee of the Education Committee 
- 2009 - 2010ChairContinuing Education Subcommittee, Mayo Clinic Florida Committees 
- 2009 - 2010MemberEducation Committee, Mayo Clinic Florida Committees 
- 2009 - presentMemberMayo Clinic, Continuing Education Committee 
- 2008 - 2011Vice PresidentBoard of Directors, Society of Atherosclerosis Imaging 
- 2008 - presentSpokespersonAmerican Heart Association 
- 2008Vice ChairCardiac Imaging Committee, Council on Clinical Cardiology, American Heart Association 
- 2008 - presentMemberProgram Committee, Council on Cardiovascular Radiology, American Heart Association 
- 2008 - 2010MemberQuality Oversight Committee, Department of Radiology 
- 2008 - 2010MemberFinance Committee, Department of Radiology 
- 2008 - 2009Ad Hoc MemberCT Chicago 2008 Meeting, American Society of Nuclear Cardiology 
- 2007 - 2010MemberACCF/AHA/SCCT/SCAI/SAIP/ACR Writing Committee Clinical Expert Consensus Statement on CT Angiography 
- 2007MemberWriting Group "Ionizing Radiation in Cardiac Imaging" (Web-only publication), American Heart Association 
- 2007 - 2009ChairWriting Group "Ionizing Radiation in Cardiac Imaging" (Web-only publication), American Heart Association 
- 2007Invited ParticipantDuke-ACC Think Tank II, American College of Cardiology 
- 2007 - 2011MemberACC/AHA/ACR/SCAI/SIR/SVMB/SVN Writing Committee "Peripheral Arterial Disease Performance Measures", American College of Cardiology 
- 2007 - 2011MemberProgram Committee, Cardiovascular Imaging 2004, 32nd Annual Meeting and Scientific Sessions, Amelia Island, FL, October 2-5, 2004 
- 2007 - 2011MemberBoard of Directors, North American Society for Cardiovascular Imaging 
- 2007 - 2010MemberAmerican Society of Nuclear Cardiology 
- 2007 - presentMemberProgram Committee, Cardiovascular Imaging 2005, 33rd Annual Meeting and Scientific Sessions, Amelia Island, FL, October 8-11, 2005 
- 2007 - presentMemberCouncil of Science Editors 
- 2006ChairModerated Poster Session: Cardiac CT IV. Chicago, IL., Annual Scientific Sessions, American Heart Association 
- 2006 - 2008SecretaryBoard of Directors, Society of Atherosclerosis Imaging 
- 2006 - 2007MemberQuality in Imaging Summit, American College of Cardiology 
- 2006ChairOral Abstract Session: Clinical II: Myocardium. 1st Annual Scientific Meeting. Arlington, VA., Society of Cardiovascular Computed Tomography 
- 2005ChairOral Abstract Session: Computed Tomography: Coronary CTA. Dallas, TX., Annual Scientific Sessions, American Heart Association 
- 2005 - presentMemberCardiac Imaging Committee, Council on Clinical Cardiology, American Heart Association 
- 2004ChairPoster Session: Coronary CT Angiography and Ischemia Assessment. New Orleans, LA., Annual Scientific Sessions, American Heart Association 
- 2004 - 2008MemberWriting Group "Noninvasive Coronary Angiography: Computed Tomography and Magnetic Resonance Imaging", American Heart Association 
- 2004 - 2006Executive Board MemberWorking Group for Cardiac CT, Deutsche Gesellschaft fur Kardiologie, Herz- und Kreislaufforschung, German Association of Cardiology 
- 2004 - presentMemberSociety of Cardiovascular Computed Tomography 
- 2003ChairOral Abstract Session: Calcium Scoring: Performance and Clinical Significance. Orlando, FL., Annual Scientific Sessions, American Heart Association 
- 2003Elected FellowCouncil on Clinical Cardiology, American Heart Association 
- 2003Elected FellowCouncil on Cardiovascular Radiology, American Heart Association 
- 2003 - presentAbstract GraderAmerican Heart Association 
- 2002 - 2003MemberResearch Committee, Department of Internal Medicine 
- 2002 - 2004ChairCardiovascular Diseases Website Development Task Force, Division of Cardiovascular Diseases, Department of Internal Medicine 
- 2002 - 2004ChairCardiovascular Clinical Practice Committee, Division of Cardiovascular Diseases, Department of Internal Medicine 
- 2001 - 2005MemberApplied Informatics Liaison Committee, Mayo Clinic Florida Committees 
- 2001Elected FellowAmerican College of Cardiology 
- 2001 - 2010MemberFlorida Medical Association 
- 2001 - 2010MemberDuval County Medical Society 
- 2001Elected FellowAmerican College of Physicians 
- 2001 - presentRelevance ReviewerBoard Certification in Cardiovascular Disease, American Board of Internal Medicine 
- 2001 - presentMemberCouncil on Clinical Cardiology, American Heart Association 
- 2001 - presentMemberAmerican Board of Internal Medicine 
- 2000 - presentMemberCouncil on Cardiovascular Radiology, American Heart Association 
- 2000 - presentMemberSociety of Atherosclerosis Imaging 
- 2000 - presentMemberSociety for Cardiovascular Angiography and Interventions 
- 2000 - presentMemberNorth American Society for Cardiovascular Imaging 
- 1999 - presentMemberWorking Group for Cardiac CT, Deutsche Gesellschaft fur Kardiologie, Herz- und Kreislaufforschung, German Association of Cardiology 
- 1996 - presentMayo Clinic Alumni Association, Mayo Clinic College of Medicine and Science, Department of Education Administration 
- 1996 - presentMemberAmerican College of Cardiology 
- 1996 - presentMemberACC/AHA/ACR/SCAI/SIR/SVMB/SVN Writing Committee "Peripheral Arterial Disease Performance Measures", American College of Cardiology 
- 1994 - presentMemberAmerican College of Physicians 
- 1993 - 2000MemberMinnesota Medical Association 
- 1993 - 2000MemberZumbro Valley Medical Society, Minnesota Medical Association 
- 1993 - presentMemberAmerican Medical Association 
- 1990 - presentMemberBerufsverband Deutscher Internisten (Professional Society of German Internists) 
- 1990 - presentMemberDeutsche Gesellschaft fur Kardiologie, Herz- und Kreislaufforschung, German Association of Cardiology 
- 1986 - presentMemberMainz Medical Society 
-  Representative of the AHAQuality in Imaging Summit, American College of Cardiology 
-  Session ChairPreventive Imaging, Cardiovascular Imaging 2004, 32nd Annual Meeting and Scientific Sessions, Amelia Island, FL, October 2-5, 2004 
-  ParticipantRead with the Experts Session, Cardiovascular Imaging 2004, 32nd Annual Meeting and Scientific Sessions, Amelia Island, FL, October 2-5, 2004 
-  Abstract GraderCardiovascular Imaging 2004, 32nd Annual Meeting and Scientific Sessions, Amelia Island, FL, October 2-5, 2004, North American Society for Cardiovascular Imaging 
-  Abstract GraderCardiovascular Imaging 2005, 33rd Annual Meeting and Scientific Sessions, Amelia Island, FL, October 8-11, 2005, North American Society for Cardiovascular Imaging 
-  MemberPoster Session: Calcium Scoring: Performance and Clinical Significance. Orlando, FL., Annual Scientific Sessions, American Heart Association