Institute of Medicine Tirgu Mures Romania, 1989
New York University Medical Center 1997-1998
New York University Medical Center 1998-2000
University of Miami Nephrology Miami, FL 2000-2002
American Board of Internal Medicine/Internal Medicine
American Board of Internal Medicine/Nephrology
AMA since 1998
ACP - ASIM since 1997
ISN since 2000
ASN since 2000
ASDIN since 2001