Sister Dr. Rosalie Bertell (April 4, 1929, Buffalo, New York – June 14, 2012) was an American author, scientist, environmental activist, epidemiologist, and sister of the Grey Nuns of the Sacred Heart, best known for her work in the field of ionizing radiation. A dual citizen of Canada and the United States, she worked in environmental health since 1970. She was a noted conspriracy theorist regarding chemtrails earthquakes, 9/11, and other fringe topics 
Rosalie Bertell was born in Buffalo to Paul G. and Helen (née Twohey) Bertell in Buffalo, New York. Her mother was Canadian, her father a citizen of the USA. In 1966, she received a Ph.D in Biometrics from the Catholic University of America. From 1969–1978, Sister Dr. Bertell was senior cancer research scientist at Roswell Park Cancer Institute. She was a consultant to the US Nuclear Regulatory Commission, the US Environmental Protection Agency, and to Health Canada.
In 1983, she received the "Hans-Adalbert Schweigart"-Medal from the World Union for Protection of Life. She was president of International Institute of Concern for Public Health from 1987 to 2004. She founded the International Medical Commission Chernobyl in 1996 and is also member of the International Medical Commission on Bhopal since 1994. Bertell was also a vocal advocate against chemtrails.[not in citation given]
Sister Dr. Bertell died at age 83 at Saint Mary Medical Center, Langhorne, Pennsylvania after a battle with cancer, in the 54th year of her religious life.
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Bertell published many articles and was editor of the journal, "International Perspectives in Public Health". She wrote the books No Immediate Danger: Prognosis for a Radioactive Earth (1985) and Planet Earth: The Latest Weapon of War (2000).
Bertell received many awards, including:
- Hans-Adalbert-Schweigart-Medal (1983)
- Right Livelihood Award (1986)
- World Federalist Peace Award
- Ontario Premier's Council on Health
- Health Innovator Award
- United Nations Environment Programme Global 500 award
- Sean MacBride International Peace Prize
- Dr. Rosalie Bertell profile at rightlivelihood.org
- ""Anti-Nuclear Nun" Rosalie Bertell Dies at 83". Democracynow.org. Retrieved June 22, 2012.
- Ilya Sandra Perlingieri (June 15, 2012). "Remembering Rosalie Bertell". Global Research.
- List of publications by Dr. Rosalie Bertell