- 2023 - presentFellowAmerican College of Cardiology 
- 2022 - presentMember, Senior Advisory BoardAmerican College of Cardiology 
- 2008Grant ReviewerGrant Committee Review, National Institutes of Health 
- 2006Review Board MemberProgram Project Grant Review Board, National Institutes of Health 
- 2006Advisory Board MemberStrategic Planning "Heart Failure and Cardiomyopathy.", National Institutes of Health 
- 2006 - presentChairpersonCardiovascular Subspecialty section, Central Society for Clinical Research 
- 2005Advisory Board MemberScios Natrecor Renal Advisory Board, National Institutes of Health 
- 2005MemberSpecial Emphasis Panel, National Institutes of Health 
- 2003ReviewerProgram Project Review Board, National Institutes of Health 
- 2003Advisory Board MemberWorking Group on Strategic Directions in Congestive Heart Failure, National Institutes of Health 
- 2003 - presentMemberAmerican Society for Clinical Investigation 
- 2002Advisory Board MemberSpecialized Center of Research (SCOR), National Institutes of Health 
- 2002Advisory Board MemberNational Center on Sleep Disorders Research "Cardiovascular Consequences of Sleep Disordered Breathing.", National Institutes of Health 
- 2001 - presentMemberCentral Society for Clinical Research 
- 2001 - presentMemberSigma Xi, The Scientific Research Society 
- 1998 - 2003MemberAbstract Grading Committee, American Heart Failure Society 
- 1995 - 2003MemberAbstract Grading Committee, American College of Cardiology 
- 1995 - presentCo-DirectorCardiorenal Laboratory, Division of Cardiovascular Diseases, Department of Internal Medicine 
- 1995 - presentMemberCardiorenal Laboratory, Division of Cardiovascular Diseases, Department of Internal Medicine 
- 1995 - presentWorkshop LeaderScientific Conference on the Pathophysiology of Tachycardia Induced Heart Failure (at the Annual Meeting), International Society for Heart Research 
- 1995 - presentMemberScientific Conference on the Pathophysiology of Tachycardia Induced Heart Failure (at the Annual Meeting), International Society for Heart Research 
- 1994 - 2000MemberAbstract Selection Committee, American Heart Association 
- 1994 - 1996MemberHeart Failure and Transplant Committee, American Heart Association 
-  Ad Hoc MemberCardiovascular Personnel Committee, Division of Cardiovascular Diseases, Department of Internal Medicine 
-  MemberCardiovascular Research Committee, Division of Cardiovascular Diseases, Department of Internal Medicine 
-  MemberEducation Committee, Division of Cardiovascular Diseases, Department of Internal Medicine 
-  MemberClinical Practice Committee, Division of Cardiovascular Diseases, Department of Internal Medicine 
-  MemberAdvisory Committee, General Clinical Research Center 
-  MemberCV Hospital Restructure Taskforce, Division of Cardiovascular Diseases, Department of Internal Medicine 
-  DiplomateAmerican Board of Internal Medicine 
-  MemberCouncil for the Kidney in Cardiovascular Disease, American Heart Association 
-  MemberAmerican Society of Echocardiography 
-  MemberAmerican College of Cardiology/ American Heart Association 
-  MemberClinical Cardiology Council, American Heart Association