Sam Johnson is a television screenwriter, comic writer and an additional voice actor (including Mr. Herrera) on several episodes of Beavis and Butt-head). With [[Chris Marcil], he wrote the Daria episodes College Bored, The Big House, The New Kid, Depth Takes a Holiday, and Speedtrapped, as well as the pilot, Sealed with a Kick. In an interview, Glenn Eichler says he believed they named Quinn, Jake, and Helen.
Johnson and Marcil also wrote for Beavis and Butt-head and issues of the spin-off comic, many featuring Daria - #6, #8, #10, #12, #21, and #27. On the parent show, they suggested a character that would evolve into Todd Ianuzzi and also contributed the term "assmunch" (which MTV initially forced Mike Judge to change it to "buttmunch").
Sam Griffin is named after him.
He has since worked on NewsRadio, Frasier, and How I Met Your Mother.