Horvitz was born on July 29, 1966, in Los Angeles, California. His older brother, Louis J. Horvitz, is a television director and producer.
Horvitz first appeared in a 1976 Freshen Up gum commercial, which led to other commercial appearances and several hand modeling jobs. After a brief stint in an off-Broadway production of Oliver! he went on to make appearances on television series such as Kids Incorporated and Safe at Home, and films such as Summer School, How I Got into College, and Deadly Weapon. From 1988 to 1991, he starred as Howie for two seasons in the syndicated television sitcom The Munsters Today.
Starting in 1993, Horvitz changed the focus of his career to voice acting, starting with the voice of Alpha 5 in the live-action series Mighty Morphin Power Rangers. From there, he had several other voice roles in such animated series as The Angry Beavers (as Daggett), Invader Zim (as Zim), Kim Possible, Dave the Barbarian (as Ned Frischman), Zatch Bell! (as Kanchomé), The Grim Adventures of Billy & Mandy (as Billy and his father Harold), Ben 10 (as Grey Matter), Squirrel Boy (as Rodney), and Shorty McShorts' Shorts (as Dudley). He also co-wrote the Grim Adventures of Billy and Mandy episode "Keeper of the Reaper" alongside his wife Kristen Lazarian.

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