TunneyBy: Jack Cavanaugh Among the legendary athletes of the 1920s, the unquestioned halcyon days of sports, stands Gene Tunney, the boxer who upset Jack Dempsey in spectacular fashion, notched a 771 record as a prizefighter, and later avenged his sole setback (to a fearless and highly unorthodox fighter named Harry Greb). Yet within a few years of retiring from the ring, Tunney willingly receded into the background, renouncing the image of jock celebrity