List of Famous people who are 21

David G. Marwell is an American historian and the former director of the Museum of Jewish Heritage in New York City. Marwell received a BA from Brandeis University and a Ph.D. in modern European history from Binghamton University.

Dan John Miller is an American singer-songwriter and actor from Detroit, Michigan. He is currently the guitarist and lead vocalist for the gothic country-garage band Blanche. He made his major film acting debut in the film Walk The Line, playing Johnny Cash's guitar player Luther Perkins.

Joseph “Joe” Klotz is an American film editor. He started his career as a television editor in New York City. Klotz' first feature film as editor, Let It Snow, won the Best Editing prize at the 1999 Festival of the American Film Institute. He was nominated for the 2009 Academy Award for Best Film Editing for Precious. Klotz has been selected for membership in the American Cinema Editors.