Robert Stone has been called one of the best of the post-Vietnam fiction writers. His dark humor has been compared to Vonnegut and his psychological complexity to Conrad. He won the National Book Award for Dog Soldiers (1974) and the PEN Faulkner prize for A Flag for Sunrise (1981). Prime Green: Remembering the Sixties (2007) is an autobiographical account of his association with Ken Kesey and the Merry Pranksters.