She is an Australian physician and anti-nuclear advocate. Her various positions include;
- Founding President of the Nuclear Policy Research Institute (now Beyond Nuclear)
- President of the Helen Caldicott Foundation (2008)
- President of Physicians for Social Responsibility
- Founder of Women’s Action for Nuclear Disarmament (now Women’s Action for New Directions)
- Founding President of Standing for Truth About Radiation Foundation.
Her 13 books include;
- Nuclear Madness (1979; revised 1994)
- Missile Envy (1984)
Nuclear Power is Not the Answer (2006) - War in Heaven: The Arms Race in Outer Space (2007)
- Carbon-Free and Nuclear-Free: A Roadmap for US Energy Policy (2007)
- If You Love This Planet: A Plan to Save the Earth (2009)
- Crisis Without End: The Medical and Ecological Consequences of the Fukushima Nuclear Catastrophe (edited, 2014)
- Sleepwalking to Armageddon: The Threat of Nuclear Annihilation (edited, 2017)
She has appeared in numerous documentary films, received 21 honorary degrees, and been awarded many prizes.