Answer: petermax

AnswerCrossword Clue
PETERMAX"Cosmic" artist of '60s and '70s psychedelia
PETERMAXPsychedelic artist whose work appeared on a postage stamp
PETERMAXWoodstock '99 poster designer
PETERMAXArtist
PETERMAXArtist on the cover of a 1969 Life magazine