Haid enjoyed his first success in showbiz as the producer of the musical "Godspell" which was then the senior project of classmate Stephen Schwartz (who went on to write the lyrics for Disney's "Pocahontas"). He went on to co-produce the NY production which inaugurated the worldwide hit. Haid also gained extensive acting experience on stage before segueing to TV and films in the 1970s. His notable feature credits include supporting roles in "Altered States" (1980), as a cranky scientist, "Cop" (1988), as a corrupt officer, and "Nightbreed" (1990), as a monster-hating sheriff. Haid has also appeared in numerous TV-movies, guest shots, and specials.