His paternal grandfather, Marcus Loew, founded Metro-Goldwyn-Mayer Studios and Loew's Theaters, and his father, Arthur Loew Sr., was a president of M-G-M.
Despite his political and criminal activities, Sullivan was undeniably a successful businessman involved in real estate, theatrical ventures (at one point partnering with Marcus Loew), boxing and horseracing.
Neiman Marcus | Marcus Garvey | Marcus Aurelius | Marcus Welby, M.D. | Greil Marcus | Marcus Brigstocke | Marcus Stephen | Marcus Vipsanius Agrippa | Marcus Rojas | Marcus Ullmann | Marcus Samuel, 1st Viscount Bearsted | Marcus Roberts | Marcus Liberty | Marcus Hahnemann | Marcus Didius Falco | Marcus Tregoning | Marcus Neff | Marcus J. Ranum | Marcus Daly | Marcus Buckingham | Marcus Borg | Marcus Aurelius Probus | Marcus Adoro | These Being the Words of Marcus Tullius Cicero | Steven Marcus | Shimmy Marcus | Marcus Westbury | Marcus Trescothick | Marcus Samuel | Marcus O'Sullivan |
Between 1931 and 1940 (at least) various line-ups of popular songwriters would form a sensational act, performing their hits across the eastern seaboard on the Loew's and Keith Circuits.