**Brian H. Dierker** is an American actor known primarily for his role in the cult film *The Big Lebowski* (1998) by the Coen brothers. In this film, he plays one of "Marty's" friends, characterized by a hippie look and the famous line "I'm the Dude."

His acting style is often associated with eccentric characters, featuring a relaxed mindset and an unconventional appearance, often with long hair and a beard, evoking surfer and "laid-back" culture. Although *The Big Lebowski* remains his most iconic role, he has also appeared in minor parts in other productions, such as *Iron Man 3* (2013).

Outside of acting, Dierker is also known as a surf instructor and a film consultant for aquatic scenes, an experience that is often reflected in his on-screen presence.