Education

Horowitz attended Hunter College High School for his early high school career, graduating in '90. University of Wisconsin—Madison (BA '94, majoring in communication arts and political science), which is where he met his future collaborator, Edward Kitsis. Horowitz was a very prolific writer and reporter for the Daily Cardinal student newspaper, writing as many as five articles in the same issue. He often caught editors off-guard with humorous leads or picking odd quotes. He worked on articles about spearfishing and the Exxon Valdez.

Television

After graduating, Kitsis and Horowitz traveled together to Los Angeles, and worked together on Fantasy Island, Felicity, and Popular, before joining the Lost team halfway through the first season. He is married to Erin Barrett Horowitz.

Horowitz and the Lost writing staff won the Writers Guild of America Award for Best Dramatic Series at the February 2006 ceremony for their work on the first and second seasons. He was nominated for the WGA Award for Best Dramatic Series again at the February 2007 ceremony for his work on the second and third seasons, at the February 2009 ceremony for his work on the fourth season of Lost and at the February 2010 ceremony for the fifth season. He also wrote Confessions of an American Bride, a made for television movie.

Film

Horowitz worked as a Writer on the Universal project Ouija Board.