Stephen H. "Steve" Shagan (born October 25, 1927) is an American novelist, screenplay writer, television and film producer.Shagan was born in Brooklyn, New York to Rachel (née Rosenzweig) and Barnard H. "Barney" Shagan. Barney ran a pharmacy, Shagan's Pharmacy, at 49 Atlantic Avenue, Brooklyn, New York, with his brother, Samuel. After Barney's death the pharmacy went bankrupt and Samuel liquidated the assets at public auction in 1949.