| First Name | Jack |
| Middle Name | Harrison |
| Last Name | Dempsey |
| Full Name at Birth | William Harrison Dempsey |
| Other Names | Manassa Mauler |
| Age | 87 (age at death) |
| Date of Birth | June 24, 1895 |
| Birthplace | Manassa, Colorado |
| Date of Death | May 31, 1983 |
| Location of Death | New York City, New York |
| Cause of Death | Heart condition |
| Height | 6' ¾" (185 cm) |
| Build | Athletic |
| Eye Color | Brown - Dark |
| Hair Color | Black |
| Star Sign | Cancer |
| Religion | Roman Catholic |
| Ethnicity | Multiracial |
| Nationality | American |
| Occupation Category | Boxing |
| Claim to Fame | World Heavyweight Title from 1919 -1926 |
| Official Website | cmgww.com |
William Harrison "Jack" Dempsey ("The Manassa Mauler") (June 24, 1895 – May 31, 1983) was an American boxer who held the world heavyweight title from 1919 to 1926. Dempsey's 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. He is listed #10 on The Ring's list of all-time heavyweights and #7 among its Top 100 Greatest Punchers. He is a member of the International Boxing Hall of Fame.
Selected Jack Dempsey film and TV show credits: