Nicholas Roerich : russian painter and spiritualist ... he got to travel through the buddhist lands before all the unpleasantness started
Alan Watts : wrote A Joyous Cosmology, the herald of modern psychedelics
Gia-Fu Feng : Spiritualist, Hiker, Translated that Tao Te Ching for all of the rest of English-language dudes
Ram Das : Be Here Now. Need I say more?
And of course, Albert Hofman : Father of LSD, isolator of Psilocybin. Hofmann calls LSD "medicine for the soul" and is frustrated by the worldwide prohibition that has pushed it underground
well, that's your perception.