Cohen was head writer for Courage the Cowardly Dog and co-wrote the screenplay for the animated feature Balto. He has also written episodes of many children's shows and sitcoms, including Pee-Wee's Playhouse, ALF (and its animated spin-offs), Living Single, George Burns Comedy Week, Phil of the Future, Tiny Toon Adventures, and Arthur. He spent a stint as consulting producer on Strangers with Candy.