her studies in biology at the University of Saskatchewan, Canada,
where she was awarded the Bachelor of Arts, Magna Cum Laude, and the
Master of Arts, with a High Honors major in biology. After two years
of study at McGill University, she attended the University of
Minnesota, studying biophysics and cell physiology. She received her
doctorate degree in 1958 from the University of Minnesota. Her own
biographical sketch states that her degree was in physiology, but
the Graduate School's Register of Ph.D. Degrees conferred by the
University of Minnesota July 1956-June 1966 states that she received
a Ph.D. in 1958 with a major in zoology and a minor in botany, with
a thesis entitled "A study of the ion balance of crayfish muscle;
evidence for two compartments of cellular potassium."
In 1979 Clark left government-funded research and began private
consulting and her own research. From 2002 until her death she
operated the Century Nutrition health clinic in Tijuana, Mexico,
where her focus was primarily on late stage cancer patients.
Meanwhile she and her son, Geoff, separately owned businesses that
her patients and others used, including a restaurant, her
self-publishing company, and a "self-health" store that sells her
inventions. Her son continues to operate the self-health store. She
published several books, including The Cure of All Cancers, The Cure
for HIV/AIDS and The Cure For All Diseases. According to civil court
records, her books had generated over $7 million in sales by 2002,
although Clark disputed this figure.
She held a naturopathy degree from the Clayton College of Natural
Health, a school that lacks accreditation from any accreditation
agency recognized by the U.S. Department of Education.