Dr. Rajiv Ranjan Prasad has vast experience in treating cancer patients for more than 30 years. He has worked as a radiation oncologist (clinical oncologist)in various organizations like State Cancer Institute, IGIMS, Patna, International Atomic Energy Agency, Vienna, Austria, and AIIMS, New Delhi. He helped in establishing many cancer and radiotherapy centers in Africa, Asia Pacific, and Oceania continents including IMRT, IGRT, SBRT, and Brachytherapy programs. He has several publications to his credit including chapters in textbooks. He participated in and coordinated several international clinical trials in the field of cancer at national and international levels results of which were published in peer-reviewed journals.