1983 - present American Society of Clinical Pathologists
1985 - present American Association for Advancement of Science
1988 - present Transplantation Society
1989 - present American Association of Pathologists
1989 - present Federation of American Societies for Experimental Biology
1990 - present Hans Popper Hepatopathology Society
1991 - present International Society for Heart and Lung Transplantation
1991 - present United States and Canadian Academy of Pathology, Inc.
1993 - present Histiocyte Society
1994 - present College of American Pathologists
1994 International Advisory Board
Argentinian Society of Transplantation
1995 - present Society of Leukocyte Biology
1999 - present The American Society of Transplant Surgeons
2002 - present The American Society for Investigative Pathology
Honors  
 
1982 Alpha Omega Alpha (Medical Honor Society)
1984, 1985 Resident Research Award, Pittsburgh Academy of Medicine
1987 PEW Scholar Program Candidate, University of Pittsburgh
Editorial boards  
 
1995 - present Xenotransplantation
1995 - present Current Opinion in Organ Transplantation
Journal Referee  
 
Digestive Diseases and Sciences
Gastroenterology
Hepatology
Human Pathology
Journal of Hepatology
Liver Transplantation and Surgery
The American Journal of Gastroenterology
The American Journal of Pathology
Transplantation
Transplantation Proceedings
Xenotransplantation