Father of actor Billy Warlock and Lance Warlock.
Has two sons and one daughter.
Out of all the people who have played Michael Myers in the various "Halloween" films, he is one of two actors to have an official website. The other is George P. Wilbur (Michael Myers from H4 and H6.).
Sold the mask, knife, scalpel, boots and suit he wore in his role as Michael Myers in Halloween II (1981) to a Haunted House owner in Ohio in 2003.
Was Kurt Russell's stunt-double for over 25 years.