Bruce Stanley Kovner was born in New York City's Brooklyn borough to Isidore Kovner, an engineer who briefly played semi-professional football, and his wife, Sophie. Kovner spent his early years in the Borough Park section of Brooklyn with his parents and three siblings before the family relocated to suburban Los Angeles in 1953. Early on, he was a high achiever, becoming a Merit Scholar. He was the student-body president of Van Nuys High School at 16, and an accomplished basketball player and pianist.