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Millbrook was a private mansion in Millbrook, New York, which was owned by Billy Hitchcock, an heir to the Mellon fortune. Timothy Leary, Richard Alpert and Michael Hollingshead retreated there following the Harvard Psilocybin Project.
Famous poets, musicians and intellectuals of the time, like Allen Ginsberg, Maynard Ferguson, the Grateful Dead, Marshall McLuhan and Ken Kesey, came from across the country to be a part of what was going on there.