Born in Melbourne, Australia in 1938, Dr Caldicott received her medical degree from the University of Adelaide Medical School in 1961. She founded the Cystic Fibrosis Clinic at the Adelaide Children’s Hospital in 1975 and subsequently was an instructor in pediatrics at Harvard Medical School and on the staff of the Children’s Hospital Medical Center, Boston, Mass., until 1980 when she resigned to work full time on the prevention of nuclear war. In 1971, Dr Caldicott played a major role in Australia’s opposition to French atmospheric nuclear testing in the Pacific; in 1975 she worked with the Australian trade unions to educate their members about the medical dangers of the nuclear fuel cycle, with particular reference to uranium mining. While living in the United States from 1977 to 1986, she co-founded the Physicians for Social Responsibility, an organization of 23,000 doctors committed to educating their colleagues about the dangers of nuclear power, nuclear weapons and nuclear war. On trips abroad she helped start similar medical organizations in many other countries. The international umbrella group (International Physicians for the Prevention of Nuclear War) won the Nobel Peace Prize in 1985. She also founded the Women’s Action for Nuclear Disarmament (WAND) in the US in 1980. Returning to Australia in 1987, Dr Caldicott ran for Federal Parliament as an independent. Defeating Charles Blunt, leader of the National Party, through preferential voting she ultimately lost the election by 600 votes out of 70,000 cast. She moved back to the United States in 1995, lecturing at the New School for Social Research on the Media, Global Politics and the Environment, hosting a weekly radio talk show on WBAI (Pacifica), and becoming the Founding President of the STAR (Standing for Truth About Radiation) Foundation.