professional societies and committees
1994 - 2003 Chairperson, American College of Gastroenterology Abstract Selection Subcommittee, Small Intestine and/or Pancreatic Disorders  
1996-Present Founder and honorary president of Turkish Gastroenterology Research Foundation.  
1999 - 2001 Chairperson, Educational Affairs Committee of American College of Gastroenterology.  
1999 - 2003 Member, International Liaison Committee, American Gastroenterology Association.  
2000 - 2002 Member, Board of Directors of American College of Gastroenterology Institute for Clinical Research and Education  
2001 - Present Member, Advisory Medical Board of Prometheus Laboratories  
2001 - Present Member, Advisory Medical Board of Centocor, Inc.