Tilman Ruff AO is a physician, co-founder and the founding international and Australian chair of ICAN, Co-President of International Physicians for the Prevention of Nuclear War (IPPNW, Nobel Peace Prize 1985), and Honorary Principal Fellow in the School of Population and Global Health, University of Melbourne; and is a past president of the Medical Association for Prevention of War (Australia) which with IPPNW established ICAN.