"The Hybridisation Historian" · b. 1942
David Michael Jacobs is a retired Professor of History at Temple University in Philadelphia, where he taught for 37 years and was one of the first academics in the United States to teach a university course on UFOs — from 1975, when doing so was professionally hazardous. He holds a PhD in history from the University of Wisconsin and published a scholarly history of UFO controversy in the United States, The UFO Controversy in America (1975), before his research took the turn into abduction investigation.
Jacobs trained in hypnotic regression under Budd Hopkins and subsequently conducted over 1,150 hypnotic regression sessions with approximately 150 abduction experiencers over 35 years. His findings — documented in Secret Life (1992), The Threat (1998), and Walking Among Us (2015) — led him to a conclusion more alarming than those of any other mainstream abduction researcher: that the phenomenon represents a deliberate, systematic alien hybridisation programme designed to eventually replace or subsume humanity.
Jacobs' central argument — based on patterns he identified across hundreds of regression sessions — is that abductions are not random or exploitative but represent systematic biological harvesting: the collection of human genetic material and the gestation of hybrid embryos that are carried to term in abductees' bodies, then removed and raised aboard craft or in an alternative environment. The hybrids, he argues, are progressively more human-looking across generations, culminating in what his witnesses describe as virtually human-appearing hybrids who are being integrated into human society — the subject of his last book.
This hypothesis — sometimes called the "Threat hypothesis" — is among the most disturbing in the UFO literature and has attracted both intense interest and serious criticism. Supporters note the cross-case consistency of specific details recovered across many witnesses with no prior contact with each other. Critics argue that Jacobs' methods (leading questions in hypnosis sessions, an investigator's prior conviction communicated to suggestible subjects) systematically produce the narrative he is looking for, and that his conclusions far outrun his evidence.
In 2012, an abductee known pseudonymously as "Emma Woods" released recordings of her regression sessions with Jacobs that raised serious ethical and methodological concerns — including questions about boundary violations in the therapeutic relationship, leading suggestions, and the conduct of hypnotic sessions. The controversy damaged Jacobs' reputation significantly within both the academic and UAP research communities and has complicated assessment of his broader body of work.
Despite the controversy, Jacobs' earlier books remain reference points for abduction research, and his insistence on taking the phenomenon seriously as a potential real-world physical event — rather than a purely psychological phenomenon — places him within the tradition of rigorous if controversial inquiry that characterises the best work in this difficult field.