Jack Dempsey

“The Manassa Mauler”

Boxing · Deceased

68-6-10RECORD

53WINS BY KO / TKO

14WINS BY DECISION

84PRO FIGHTS

Profile

Full name	William Harrison Dempsey
Nickname	The Manassa Mauler
Date of birth	24 Jun 1895
Died	31 May 1983
Nationality	American
Birthplace	Manassa, Colorado, USA
Based in	Not added yet
Weight classes	Heavyweight
Trainers	Jimmy DeForest
Height	185 cm (6′1″)
Reach	185 cm (73″)
Stance	Orthodox
Years active	1914–1927
Status	Deceased
Pro debut	18 Aug 1914
Last fight	Loss vs Gene Tunney, 22 Sep 1927

Details on this page were compiled from public information on 8 Oct 2026 (the record is as of that date).

Titles and honours

World heavyweight champion from 1919 to 1926
Won the title from Jess Willard in 1919 by corner retirement after round 3
Defended the title against Billy Miske, Bill Brennan, Georges Carpentier, Tommy Gibbons and Luis Angel Firpo
Lost the title to Gene Tunney in 1926 and the 1927 rematch

Background

Raised in Colorado and Utah, he became one of the most famous heavyweight champions, headlining the first million-dollar gate against Georges Carpentier in 1921.

Fight history

84 professional fights. Newest first.

Result	Opponent	Method	Round	Time	Date	Location	Notes
Loss	Gene Tunney	Decision (unanimous)	10		22 Sep 1927	Chicago, Illinois, USA	For world heavyweight title
Win	Jack Sharkey	KO	7	0:45	21 Jul 1927	New York City, New York, USA
Loss	Gene Tunney	Decision (unanimous)	10		23 Sep 1926	Philadelphia, Pennsylvania, USA	Lost world heavyweight title
Win	Luis Ángel Firpo	TKO	2	0:57	14 Sep 1923	New York City, New York, USA	Retained world heavyweight title
Win	Tommy Gibbons	Decision (points)	15		4 Jul 1923	Shelby, Montana, USA	Retained world heavyweight title
Win	Georges Carpentier	KO	4		2 Jul 1921	Jersey City, New Jersey, USA	Retained world heavyweight title
Win	Bill Brennan	KO	12	1:57	14 Dec 1920	New York City, New York, USA	Retained world heavyweight title
Win	Billy Miske	KO	3	1:13	6 Sep 1920	Benton Harbor, Michigan, USA	Retained world heavyweight title
Win	Jess Willard	TKO (corner retirement)	3		4 Jul 1919	Toledo, Ohio, USA	Won world heavyweight title
Win	Tony Drake	KO	1		2 Apr 1919	New Haven, Connecticut, USA
Win	Eddie Smith	KO	1		13 Feb 1919	Altoona, Pennsylvania, USA
Win	Kid Harris	KO	1		29 Jan 1919	Easton, Pennsylvania, USA
Win	Kid Harris	KO	1		23 Jan 1919	Reading, Pennsylvania, USA
Win	Big Jack Hickey	KO	1		20 Jan 1919	Harrisburg, Pennsylvania, USA
Win	Jack Maguire	KO	1		16 Jan 1919	Trenton, New Jersey, USA
Win	Carl Morris	KO	1	1:00	16 Dec 1918	New Orleans, Louisiana, USA
Win	Gunboat Smith	KO	2		16 Dec 1918	Buffalo, New York, USA
Win	Billy Miske	Decision (points)	6		28 Nov 1918	Philadelphia, Pennsylvania, USA	Newspaper decision
Win	Dan Flynn	KO	1	2:16	18 Nov 1918	Philadelphia, Pennsylvania, USA
Win	Battling Levinsky	KO	3		6 Nov 1918	Philadelphia, Pennsylvania, USA
Win	Jack Moran	KO	1	1:10	14 Sep 1918	Reno, Nevada, USA
Loss	Willie Meehan	Decision (points)	4		13 Sep 1918	San Francisco, California, USA
Win	Terry Kellar	TKO	5		24 Aug 1918	Dayton, Ohio, USA
Win	Fred Fulton	KO	1	0:23	27 Jul 1918	Harrison, New Jersey, USA
Win	Dan Flynn	KO	1		6 Jul 1918	Atlanta, Georgia, USA
Win	Bob Devere	KO	1		4 Jul 1918	Joplin, Missouri, USA
Win	Tom McCarty	KO	1	0:30	1 Jul 1918	Tulsa, Oklahoma, USA
Win	Arthur Pelkey	KO	1	1:00	29 May 1918	Denver, Colorado, USA
Win	Dan Ketchell	KO	2		22 May 1918	Excelsior Springs, Missouri, USA
Win	Billy Miske	Decision (points)	10		3 May 1918	Saint Paul, Minnesota, USA	Newspaper decision
Win	Tom Riley	KO	1		25 Mar 1918	Joplin, Missouri, USA
Win	Fred Saddy	KO	1		16 Mar 1918	Memphis, Tennessee, USA
Win	Bill Brennan	TKO	6		25 Feb 1918	Milwaukee, Wisconsin, USA
Win	Fireman Jim Flynn	KO	1	1:10	14 Feb 1918	Fort Sheridan, Illinois, USA
Win	Carl Morris	Disqualification	6		2 Feb 1918	Buffalo, New York, USA
Win	Homer Smith	KO	1	1:15	24 Jan 1918	Racine, Wisconsin, USA
Win	Carl Morris	Decision (points)	4		2 Nov 1917	San Francisco, California, USA
Win	Gunboat Smith	Decision (points)	4		2 Oct 1917	San Francisco, California, USA
Win	Bob McAllister	Decision (points)	4		26 Sep 1917	Emeryville, California, USA
Win	Willie Meehan	TKO	1		19 Sep 1917	Emeryville, California, USA
Win	Charley Miller	TKO	1		19 Sep 1917	Emeryville, California, USA
Draw	Willie Meehan	Decision (points)	4		7 Sep 1917	San Francisco, California, USA
Draw	Willie Meehan	Decision (points)	4		10 Aug 1917	San Francisco, California, USA
Win	Al Norton	KO	1		1 Aug 1917	Emeryville, California, USA
Win	Willie Meehan	Decision (points)	4		25 Jul 1917	Emeryville, California, USA
Draw	Al Norton	Decision (points)	4		11 Apr 1917	Oakland, California, USA
Loss	Willie Meehan	Decision (points)	4		28 Mar 1917	Emeryville, California, USA
Draw	Al Norton	Decision (points)	4		21 Mar 1917	Oakland, California, USA
Loss	Fireman Jim Flynn	KO	1	0:25	13 Feb 1917	Murray, Utah, USA
Win	Young Hector	KO	2		29 Nov 1916	Salida, Colorado, USA
Win	Dick Gilbert	Decision (points)	10		16 Oct 1916	Salt Lake City, Utah, USA
Win	Terry Kellar	Decision (points)	10		7 Oct 1916	Ely, Nevada, USA
Win	Young Hector	TKO (corner retirement)	3		28 Sep 1916	Murray, Utah, USA
Draw	John Lester Johnson	Decision (points)	10		14 Jul 1916	Harlem, New York, USA	Newspaper decision
Win	Bert Kenny	Decision (points)	10		8 Jul 1916	Bronx, New York, USA	Newspaper decision
Win	Andre Anderson	Decision (points)	10		24 Jun 1916	Bronx, New York, USA	Newspaper decision
Win	Bob York	KO	4		30 May 1916	Price, Utah, USA	For Pacific Coast light heavyweight title
Win	Dan Ketchell	TKO	3		17 May 1916	Provo, Utah, USA
Win	Terry Kellar	Decision (points)	10		3 May 1916	Ogden, Utah, USA
Win	Joe Bonds	Decision (points)	10		8 Apr 1916	Ely, Nevada, USA
Win	George Christian	KO	1		17 Mar 1916	Price, Utah, USA
Win	Cyril Kohen	KO	4		9 Mar 1916	Provo, Utah, USA
Win	Boston Bearcat	KO	1		23 Feb 1916	Ogden, Utah, USA
Win	Jack Downey	KO	2		21 Feb 1916	Salt Lake City, Utah, USA
Win	Swede Johnson	KO	2		5 Feb 1916	Ely, Nevada, USA
Win	Johnny Sudenberg	KO	2		1 Feb 1916	Ely, Nevada, USA
Win	Jack Gillian	TKO	1		20 Dec 1915	Salt Lake City, Utah, USA
Draw	Jack Downey	Decision (points)	4		13 Dec 1915	Salt Lake City, Utah, USA
Win	George Coplen	KO	6		19 Nov 1915	Cripple Creek, Colorado, USA
Win	Andy Malloy	KO	3		23 Oct 1915	Montrose, Colorado, USA
Win	Andy Malloy	Decision (points)	10		7 Oct 1915	Durango, Colorado, USA	Newspaper decision
Win	Fred Woods	KO	4		23 Sep 1915	Montrose, Colorado, USA
Draw	Johnny Sudenberg	Decision (points)	10		11 Jun 1915	Tonopah, Nevada, USA
Draw	Johnny Sudenberg	Decision (points)	10		31 May 1915	Goldfield, Nevada, USA
Win	Emmanuel Campbell	TKO	4		26 Apr 1915	Reno, Nevada, USA
Loss	Jack Downey	Decision (points)	10		5 Apr 1915	Salt Lake City, Utah, USA
Win	Chief Gordon	KO	6		1 Apr 1915	Utah, USA
Win	John Pierson	KO	7		3 Mar 1915	Utah, USA
Draw	Chief Geronimo	Decision (points)	4		26 Feb 1915	Pocatello, Idaho, USA
Win	Joe Lyons	KO	9		2 Feb 1915	Utah, USA
Win	Battling Johnson	KO	1		1 Jan 1915	Utah, USA	Exact date unknown
Win	Billy Murphy	KO	1		30 Nov 1914	Salt Lake City, Utah, USA
Win	Young Hancock	KO	1		2 Nov 1914	Salt Lake City, Utah, USA
Draw	Young Herman	Decision (points)	6		18 Aug 1914	Colorado Springs, Colorado, USA