Theodore X. Barber

Theodore X. Barber(1927–2005) was an American psychologist who along with Sheryl C. Wilson first identified the fantasy prone personality in 1981.

Along with David Smith Calverley (1937–2008) he studied "hypnotic behavior". They measured how susceptible patients were to hypnotic induction. One result of their research was showing that the hypnotic induction was not superior to motivational instructions in producing a heightened state of suggestibility.

The Barber Suggestibility Scale, a product of their research, measures hypnotic susceptibility with or without the use of a hypnotic induction.