Karl Diedrich Bader is an American actor, voice actor, and comedian.
Karl Diedrich Bader was born in Alexandria, Virginia, on Christmas Eve, 1966, the son of Gretta Bader (née Margaret Marie Lange; 1931–2014), a sculptor, and William B. Bader(1931–2016), a foundation executive and political activist. His patrilineal great-grandfather was Edward Lawrence Bader, who was mayor of Atlantic City, New Jersey.
When Bader was two years old, his family moved to Paris, but he returned to the U.S. to attend Groveton High School. He graduated from T.C. Williams High School in Alexandria, Virginia, and attended college at the University of North Carolina School of the Arts.
Bader has been married to actress Dulcy Rogers since 1997. Together they have two children, Ondine and Sebastian.