David Sullivan is a private investigator and owner of Sullivan Associates International with offices in the San Francisco Bay Area and Rio de Janeiro. With a background in cultural anthropology, David studied cults for 40 years and has been investigating them for over 20 years. His broad experiences due to living in Europe, North Africa, Latin America and the United States, made him a perfect candidate to infiltrate cults. This journey, he says, has made him many enemies, therefore he is careful about how much he discloses to the public. He has worked extensively with leading psychologists and experts in the field of cults, mind control, undue influence, abuse of children, the elderly, mentally ill, and the developmentally disabled.