Born in Chicago, he graduated from Jesus College, Cambridge in England, and found work in Warner Bros. film library, rising to become head of the Montage Department, where he directed thousands of montages, including the opening montage for "Casablanca".
Born in Chicago, he attended schools in New York and later graduated from Jesus College, Cambridge in England. Siegel found work in Warner Bros. film library after meeting producer Hal Willis, and later rose to head of the Montage Department, where he directed thousands of montages, including the opening montage for "Casablanca".