William Harrison "Jack" Dempsey (June 24, 1895 – May 31, 1983), also known as "Kid Blackie" and "The Manassa Mauler", was an American professional boxer, who became a cultural icon of the 1920s. Dempsey held the World Heavyweight Championship from 1919 to 1926, and his aggressive 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.