George Estabrooks

Estabrooks joined the First Canadian Division before he turned 20, becoming the youngest commissioned officer at that time. He eventually emigrated to the United States, where he consulted with the FBI regarding the effectiveness of hypnosis in interrogations of juvenile delinquents. During WWII, he helped the US military create "hypnotic couriers"—agents who could carry secret information in their subconscious without knowing they were doing so, making them "un-interrogatable."

After the war he was a professor of psychology at Colgate University, and a visiting professor at SUNY College at Oswego, (1964–1966) and Monmouth College (Illinois) (1966–67). He became a 32nd degree Knight Templar Mason. Between 1941 and 1961, he wrote, co-wrote and edited a total of six books Man, The Mechanical Misfit (1941), Hypnotism (1943), Death in the Mind [a hypnosis-themed novel, written in collaboration with the mystery writer Richard Lockridge] (1945), Spiritism (1947), Hypnosis: Current Problems with Nancy Gross (1960), and The Future of the Human Mind, a Symposium (1961).

In an interview with the Village Voice, Jane Roberts revealed that "Dr. Instream" was a pseudonym for Estabrooks in the Seth Material and that he conducted remote viewing tests of "Seth" for about one year, during 1966, while on the SUNY-Oswego faculty.