At Crespi Carmelite High School in Encino, California, Horwitz was Mission League MVP, All-Valley, and first team All-CIF Division I as a senior, batting .415.
The high school record in the 180 yard low hurdles dates to 1964 when three boys, Earl McCullouch from Long Beach Polytechnic High School, Don Castronovo from Oceanside High School in Oceanside, New York and Steve Caminiti from Crespi Carmelite High School in Encino, California separately ran the 180 yard low hurdles at 18.1.
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