You might not know his name, but you'd know him if you saw him (or heard him).
http://366weirdmovies.com/the-wallace-shawn-interview/ (http://366weirdmovies.com/the-wallace-shawn-interview/)
Great interview - always been a big fan! It would be inconceivable to NOT be a fan (lame, I know, but SOMEONE was gonna say it, so I was first...)
This is pretty insightful re: don peyote, just wrote my first thoughts (http://www.badmovies.org/forum/index.php/topic,142617.msg527397.html#msg527397) on it. I did like the contrast of negative and positive drug experiences.