David M. Jacobs, Ph.D. is a retired professor of history at Temple University. He specialized in twentieth century American history and culture. Dr. Jacobs began researching the controversy over unidentified flying objects in America in the mid 1960's, and has amassed over 45 years of primary research data and analytical hypotheses on the subject. Since 1973 Dr. Jacobs has continued to devote most of his professional and personal energies to researching the UFO phenomenon in general, and the abduction phenomenon in particular. Having conducted over 1000 hypnotic regressions with over 150 abductees, Dr. Jacobs is one of the foremost UFO abduction researchers worldwide. As a result of his extensive primary research, he has developed the first scientific typology of the abduction experience. Dr. Jacobs has written and delivered many articles, papers, and addresses on the subject of UFO abduction, and has been a consultant to the major UFO organizations. In 1992 Dr. Jacobs' second book, Secret Life: Firsthand Accounts of UFO Abductions www.ufoabduction.com, was published by Simon & Schuster. The book was the most complete exposition of the structure and meaning of the abduction phenomenon then published. The Threat www.ufoabduction.com was published by Simon & Schuster in January, 1998. The book addresses important questions about abductions, and clarifies issues that have been the subject of much speculation for the past fifty years. The Threat presents the first evidence-driven hypothesis that provides a falsifiable solution to the UFO mystery. In 2000, Dr. Jacobs published the edited book, UFOs and Abductions: Challenging the Borders of Knowledge, www.ufoabduction.com with ten expert authors writing about the UFO and abduction phenomenon with the academic community as the target audience.The book is one of the few about abductions and UFOs ever published by an academic press. In addition, Dr. Jacobs has lectured on the subject of UFO abduction at universities and colleges across the country.