Greydon Clark was born on February 7th, 1943 in Niles, Michigan. Clark attended Valparaiso University near Chicago and studied acting with coach John Morley. He supported himself as a door-to-door salesman prior to breaking into the movie business. Clark began his cinematic career as an actor in several enjoyably lowbrow exploitation features for legendary Grade Z director Al Adamson; he gave a memorably offbeat performance as wacky drugged-out biker Acid in the splendidly sleazy "Satan's Sadists" (Greydon also wrote the script for this movie under the pseudonym Dennis Wayne). Clark also appeared in "Hell's Bloody Devils" and the laughably lousy "Dracula vs. Frankenstein" for Adamson. Greydon has directed an entertainingly diverse array of pleasingly lowbrow low-budget drive-in pictures and straight-to-video offerings from the early 70s up until the late 90s; they include the trashy blaxploitation double whammies "The Bad Bunch" and "Black Shampoo," the silly "Satan's Cheerleaders," the nifty sci-fi/horror item "Without Warning," the amusing slasher spoof "Wacko," the hilariously raunchy "Joysticks," the uproariously awful killer mutant cat camp hoot "Uninvited," and the especially atrocious "Skinheads." In addition to directing, Clark often writes and produces his own movies and sometimes essays small roles in his films. Greydon both wrote the script and pops up in a minor part in the fun supernatural revenge opus "Psychic Killer." His late actress wife Jacqueline Cole appears in several of his films.