Albert Tracy Leffingwell, M.D., was a physician, social reformer, and vocal advocate for vivisection reform. He also served as the president of the American Humane Association. He founded the American Society for the Regulation of Vivisection, which advocated regulation of vivisection subjected to surveillance.
Leffingwell wrote several books highlighting the cruelty of animal experimentation and advocating for regulation. He was also concerned with meat safety, believing that lax regulations, in particular allowing cancerous animals into the food chain, were responsible for increases in the incidence of cancer.
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