Mason Wilson Gamble (born January 16, 1986) is a former American actor and marine biologist known for his portrayal of Dennis Mitchell in the 1993 film Dennis the Menace, a role he got after beating out a reported 20,000 children who had auditioned, and as Jason Schwartzman's sidekick, Dirk Calloway, in Wes Anderson's critically acclaimed 1998 film Rushmore. He also appeared in Anya's Bell with Della Reese, starring as a dyslexic boy. In 1999, Gamble portrayed Brady Lang in the thriller Arlington Road. He had a featured role in the short-lived 2001 CBS drama Kate Brasher. Additionally, he had a small role as McCluckey in the 1996 comedy Spy Hard.