As of 2006, Haig donates 10% of his profits from conventions and appearances to charity.
Attended the Pasadena Playhouse 1959-1961. Roommate of Stuart Margolin.
Certified hypnotherapist.
Drummer for the late 1950s band The T-Birds, who released the single "Full House".
He and Pam Grier appeared in many "blaxploitation" films in the 1970s, Haig usually playing a thug. So when Grier walked onto the courtroom set of Jackie Brown (1997), and saw that Quentin Tarantino had cast him as the judge, she burst out laughing.
Not exactly fond of the dialogue he was given in Galaxy of Terror (1981), Haig opted to play the character mute for most of the movie. When producer Roger Corman asked him why he was trying to play the role without dialogue, Haig's response was, 'Have you read it?'.