Dr.Tripathi is an active Emeritus at the Notre Dame Radiation laboratory, University of Notre Dame, IN. In 1976-77 he was on the faculty of the University of Manchester, UK and UMIST and before that at the Physics Department, Pt. Deen Dayal Upadhyay University, Gorakhpur.
Dr. Tripathi has worked very closely with Dr. MM Joshi, as both shared the same PhD supervisor in India.
He is a prominent academician, Hindu scholar and eminent radiation scientist.