Madan Rehani is currently director of global outreach for radiation protection at the Massachusetts General Hospital, Harvard Medical School, Boston, US, and an adjunct professor at the Duke University Medical Center, Durham, NC, US. He worked earlier for over 11 years at the International Atomic Energy Agency (IAEA), Vienna, Austria. He was professor and head of medical physics at the All India Institute of Medical Sciences (AIIMS), New Delhi, India, before joining the IAEA in 2001. He was also head of the World Health Organization ’s (WHO) Collaborating Centre on Imaging Technology & Radiation Protection, which he established in 1997. He held faculty positions at different levels from 1977-2001 in different medical institutes in India. He is currently president (2018-2021) of the International Organization for Medical Physics (IOMP). He is a member of the International Commission on Radiological Protection (ICRP). Under his chairmanship, 4 Annals of the ICRP have been published, and another 4 with him as member of the Task Group. He is senior editor of The British Journal of Radiology, associate editor of Medical Physics and was assistant editor of American Journal of Roentgenology for several years.