Name	Known for
Hugh Quarshie Self - Narrator (voice) Self - Narrator (voice) See fewer	Star Wars: Episode I - The Phantom Menace (1999)
Glacus De Silva Brito Self / UDV Church Self / UDV Church See fewer	Horizon (I) (1964)
Charles Grob Self / Psychiatrist Self / Psychiatrist See fewer	Serpent and the Sun: Tales of an Aztec Apprentice (2009)
Stanislav Grof Self / Psychiatrist USA Self / Psychiatrist USA See fewer	Brainstorm (1983)
Willis Harman Self / Stanford Univ. Self / Stanford Univ. See fewer	Horizon (I) (1964)
Abram Hoffer Self / Psychiatrist Canada Self / Psychiatrist Canada See fewer	Hofmann's Potion (2002)
Karl Jansen Self / Psychiatrist UK Self / Psychiatrist UK See fewer	Horizon (I) (1964)
Humphry Osmond Self / Psychiatrist USA (as Humphrey Osmond) Self / Psychiatrist USA (as Humphrey Osmond) See fewer	Acid Delirium of the Senses (1968)
Rick Strassman Self / Neuroscientist Canada Self / Neuroscientist Canada See fewer	DMT: The Spirit Molecule (2010)
Curtis Wright Self / FDA Self / FDA See fewer	Horizon (I) (1964)