 Brennan worked as a Bartender between fights, earning him the nickname "Battling Bill the Bartender".According to one source, Brennan achieved a third-round knockout of Jack Cameron in 1914, and two ten-round newspaper decisions from Marty Cutler on April 13 and July 2, 1914 in Aurora, Illinois.Cutler fought some talented opposition in his career including Jack Johnson, Sam Langford, and Jack Dillon, though his record was poor.