Podiatric surgeon and ufologist best known as an investigator of alien implants. Leir appeared frequently on television and talk radio programs devoted to ufology. Leir said he had removed about a dozen implants from people's bodies and claimed they were devices that "emit radio signals." Leir alleged that implants had moved by themselves during surgery as if to avoid removal. Leir said that laboratory testing of the implants implied they were of extraterrestrial origin.