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