Dr. Tilman Ruff AO is a physician, immediate past co-president and board member of International Physicians for the Prevention of Nuclear War (IPPNW, Nobel Peace Prize 1985), co-founder and founding chair of the International Campaign to Abolish Nuclear Weapons (ICAN, Nobel Peace Prize 2017), and Honorary Principal Fellow in the School of Population and Global Health, University of Melbourne. He is past national president of the Medical Association for Prevention of War (Australia). Dr. Ruff was director of travel medicine at Royal Melbourne Hospital, worked on hepatitis B control, immunisation and maternal and child health in Indonesia and Pacific island countries, and documented the link between nuclear tests and outbreaks of ciguatera fish poisoning in the Pacific. He was an international medical advisor for the Australian Red Cross (1996-2019) and a founding member of WHO’s Western Pacific Expert Resource Panel on Hepatitis B Control. In 2012 and 2019, he received national honours for his work for nuclear weapons abolition and public health through immunisation.