As an all-around horseman, Marvin Childs earned a reputation as a fine trainer-driver while still a young man traveling the Grand Circuit before World War I. It was in 1927 that Childs won the Hambletonian and Kentucky Futurity with Iosola's Worthy. Among the other champions he campaigned were trotters Reynolda, Calumet Bush and Charlotte Hanover and pacers Ben Earl, Hal Boy and Hal Mahone. Marvin Childs was superintendent at two of the major Standardbred nurseries during his career. He was at Henry Knight's Almahurst Farm for thirteen years and then at Hanover Shoe Farms. After his death at age 78 in 1967, Lawrence Sheppard said of Childs, "He was a horseman's horseman."
Published in the Harness Racing Museum's 1994 book, The Immortals