Author, scholar, visionary, psychonaut, butterfly collector and self-proclaimed alchemist in the tradition of transmuting human consciousness to gold, Terence McKenna was one of the greats.
A weekend at his novelty conference at Esalen in '96 changed my life forever. It made me turn left instead of right (on Highway 1). When I found out he had a lethal brain tumor I burst out crying and when he died I wrote a rambling, grief-and-starstruck obituary, published in the Anchorage Press. I hope it does him justice.
Terence was recently humanized by his brother Denis in his excellent book Brotherhood of the Screaming Abyss.
If you're not familiar his work don't walk, click on Lorenzo Hagerty's Psychedelic Salon to find every Terence McKenna recording known to man or ape.
We will never know his equal.
(though OMG that timewave theory of his needed to stop! :-)