Hulda Regehr Clark was a Canadian-born alternative-health author and researcher best known for popularizing the “Zapper,” a small low-voltage electrical frequency device she claimed could kill parasites, bacteria, and other disease-causing organisms. She was born October 18, 1928, in Rosthern, Saskatchewan, and died September 3, 2009, in Chula Vista, California. She earned degrees from the University of Saskatchewan and received a Ph.D. from the University of Minnesota in 1958.
Clark became widely known through books such as The Cure for All Cancers, The Cure for All Diseases, and related works in which she argued that many illnesses were caused by parasites and environmental pollutants. Her Zapper and “Syncrometer” became central tools in her system. Her claims, however, were highly controversial and were challenged by medical authorities and regulators; the Federal Trade Commission charged associated companies with making unsubstantiated health claims about the Zapper, Syncrometer, and cancer-treatment regimens.
A concise neutral bio might read:
Hulda Regehr Clark, Ph.D. was a Canadian-born researcher, naturopathic practitioner, and alternative-health author best known for developing and popularizing the electronic device known as the Zapper. Trained in biology and physiology, Clark proposed that many chronic diseases were associated with parasites, toxins, and environmental pollutants, and she promoted electrical frequency devices, herbal cleansing, and detoxification methods as corrective measures. Her work attracted a devoted following in alternative-health circles, while also drawing strong criticism from conventional medical authorities because her disease-treatment claims were not scientifically validated. Clark remains a controversial figure whose legacy lies at the intersection of bioelectrical experimentation, alternative medicine, and debates over medical authority.