I saw him give a talk way back in 70 or 71 at the college I was attending, very interesting guy. He was a Madison Avenue Ad dude, as I remember, (7 Up the uncola) and he dropped out of that right before I saw him. He had a newspaper "comic", a syndicated little artwork picture that would appear every week for awhile. But it seems he got back into making lots of money again.
My sister-in-law had a Peter Max dress back in the day. She was wild about it. I just had a few posters.