Mark Gregory was born Marco De Gregorio in Rome. After appearing in a number of Italian exploitation films, such as the Thunder trilogy and Castellari's Bronx films, he disappeared from the big screen. In 2013 he committed suicide.
L'ultimo bus di guerra
Thunder
Adamo ed Eva, la prima storia d'amore
Thunder II
1990: I guerrieri del Bronx
Fuga dal Bronx
Missione finale
Delta Force Commando
Un maledetto soldato
Thunder III