Badri Nath Tandon obtained his MD from the King George Medical College, Lucknow. He took advanced training in gastroenterology at the Massachusetts Institute of Technology, Cambridge. His main contribution was research on bowel diseases, effects of malnutrition on intestine, pancreas and liver. He studied the role of pathogens and food toxins in various diseases. His work helped the discovery about pyrrolizidine alkaloids in Jhunjhunia seeds causing veno-occlusive disease of the liver. He isolated Hepatitis E virus and found a therapeutic protocol of the Hepatitis E and Hepatitis C using herbal plants. He established the Department of Gastroenterology at AIIMS. Dr. Tandon was awarded Padma Bhushan (1986), The Sasakawa WHO Health Prize of the World Health Organization (1990) and the Jubilee Medal of the Russian Academy of Medical Sciences, Kent Memorial Award of the National Homoeopathic Association, Lifetime Achievement Award of the New Delhi chapter of the Indian Medical Association and the inaugural Lifetime Achievement Award of Indian society of Gastroenterology (2007).

Bashir Ahmad obtained his PhD degree from the University of London. He made contributions in the fields of vitamins, hormones, carotene and basal human metabolism. He developed processed products from amla powder, amla preservatives, juice and vitamin C syrup. He studied calcium, phosphorus and phytin content of the diet of the people of Kangra Valley, where occurrence of rickets was high. He also studied relationship between vitamin A reserves with the nutrition level. Dr. Ahmad was a Fellow of Royal Institute of Chemistry (London), Member Biochemial Society (London), Indian Chemical Society, Indian Pharmaceutical Congress (President, 1942), Physiology Section, Indian Science Congress ( President, 1948).