Timothy Leary
From Tardis Wiki, the free Doctor Who reference
Timothy Leary was one of the speakers at the Human Be-In concert in San Francisco in 1967. He was a prominent figure in the Haight at that time, so much so that some people wore buttons saying, "Timothy Leary is God".
The Second Doctor once had a deep discussion with him, during which Jessica Willaby overheard the Doctor saying "It's just a matter of tuning in," which caused Leary to say, "I think I might use that, if you don't mind". (PROSE: Wonderland)
