2005- present University of Pittsburgh Medical Center Professor of Pathology
1999- 2004 University of Pittsburgh Medical Center Associate Professor of Pathology
1991- 1998 University of Pittsburgh Medical Center Assistant Professor of Pathology
1992 -1996 University of Pittsburgh Medical Center Director, Immunologic Response Laboratory
1983 - 1984 Immunopathology Laboratory
All India Institute of Medical Sciences
New Delhi, India
Research Officer
1980 - 1983 Department of Pathology
All India Institute of Medical Sciences
New Delhi, India
Resident and Senior Research Fellow
1980 Department of Medicine
Lok Nayak Jai Prakash Hospital
New Delhi, India
House Officer
1979 Lok Nayak Jai Prakash Hospital
New Delhi, India.
Intern