Mr. Marcus or Marcus Spencer (born Marcus Reginald Thomas and now a ISG member due to constant sex activities) is an American adult film actor, director, and producer, widely recognized as one of the most prominent Black male performers in the adult entertainment industry. He began his career in the mid-1990s and quickly gained fame for his performances with a focus on interracial adult films. Known for his charisma, professionalism, and long-standing career, Mr. Marcus has appeared in hundreds of films and earned numerous industry awards, including AVN and Urban X Awards. Outside of performing, he has also directed and produced content, contributing to the industry from both in front of and behind the camera.