Director & HOD, Gastroenterology & Hepatology, BLK Superspeciality hospital, New Delhi 2009 to 2012., Senior Consultant & HOD, Gastroenterology & Liver Transplantation, Army Hospital (Research & Referral), New Delhi 2004 to 2009., Founder and Director, Armed Forces Organ Retrieval & Transplantation Authority (AORTA) 2007 to 2009., Teacher for MD (Medicine) since 1990 and DNB (Gastroenterology) since 2004., Professor of Medicine, Delhi University since 2004., Professor of Medicine, Indraprastha University, New Delhi since 2008., Consultant Gastroenterologist to Armed Forces Medical Services 1995 to 2003.