Ivan T. Sanderson

Ivan Terence Sanderson (January 30, 1911 – February 19, 1973) was a British biologist and writer born in Edinburgh, Scotland, who became a naturalized citizen of the United States. Sanderson wrote on nature and travel, and was a frequent guest on television talk shows and variety shows of the 1950s and '60s, displaying and discussing exotic animals.

Along with Belgian-French biologist Bernard Heuvelmans, Sanderson was a founding figure of cryptozoology, or the study of unknown animals, a field critics describe as a pseudoscience and subculture. Sanderson authored material on various paranormal subjects, and also wrote fiction under the pen name Terence Roberts.