Jack "Doc" Kearns was an American boxer and boxing manager. He was born on a farm in Waterloo, Michigan to Phillip H. McKernan and Frances M. Knauf, daughter of German immigrant and Waterloo, Michigan, settler Peter Knauf. His father was the son of Irish immigrants Philip and Amelia "Ann" McKernan and is noted as being "among the early pioneers in the Northwestern Territories of Montana, Idaho and Washington."

William Harrison "Jack" Dempsey, nicknamed Kid Blackie and The Manassa Mauler, was an American professional boxer who competed from 1914 to 1927, and reigned as the world heavyweight champion from 1919 to 1926. A cultural icon of the 1920s, Dempsey's aggressive fighting style and exceptional punching power made him one of the most popular boxers in history. Many of his fights set financial and attendance records, including the first million-dollar gate. He pioneered the live broadcast of sporting events in general, and boxing matches in particular.