Yvonne is the author of Chosen: Recollections of UFO Abductions Through Hypnotherapy, Coronado: The President, The Secret Service and Alien Abductions, and Chosen: From the Alien Hybrid Program to the Fate of the Planet. In these books, Yvonne has taken the time to reveal explicit and dramatic transcripts of clients’ descriptions during hypnotherapy, their recollections of alien encounters and abductions.

Upon graduating from the California Hypnosis Motivation Institute in 1991 as a Certified Hypnotherapist, she immediately began to work with post-traumatic stress disorder (PTSD) patients. She observed through hypnotherapy what many of her subjects described as a pattern of alien abduction or other close encounter experiences. Since she felt group therapy would assist in their trauma recovery, Yvonne founded Close Encounter Research Organization (CERO) in 1992. CERO conducts monthly meetings to this day.

Yvonne’s many television appearances have included The Joan Rivers Show, The Montel Williams Show, History Channel, MSNBC, The Discovery Channel, Encounters, and Sightings. In addition, well-known radio hosts Art Bell, Paul Harvey, Dr. David Viscott, and George Noory have had Yvonne as their special guest. Yvonne has frequently been a consultant to producers, directors, and actors for film and television programs.