Born in Atlanta, Georgia, the 6'7 forward attended University of North Alabama, where he won the 1990-91 NCAA Division II Championship. Dorsey had spells in the Dominican Republic (With San Martin) and with his hometown USBL team the Atlanta Trojans, before signing for British professional outfit Birmingham Bullets in 1994, which was to start his love-affair with the British hoops scene.
Dorsey made his debut for the Bullets on September 9, 1994, when the Sheffield Sharks were the visitors. In his first season Dorsey played 24 games for the Midlanders, averaging an impressive 21.88 points-per-game, a total of 525 points for his rookie season. Tony could only get better and his second season, (1995-96) saw him score an amazing 1008 points in 36 games (Which stands as the second-highest single season scoring mark in the BBL in the past 12 years), an incredible average of 28 PPG which resulted in picking up BBL Player of the Year award for that season as well as being named in the All-Star team, not to forget winning the Championship final with the Bullets.
Dorsey joined the Manchester Giants in 1998 and won the Championship, Trophy and Play-off titles with them in two seasons.
He is also naturalised as a British citizen and played 15 times for England, scoring 193 points.
On November 17, 2006 Dorsey signed for the Newcastle Eagles  signalling a return to the British Basketball League. He made his debut for the Eagles on November 19, 2006 in an 81-75 defeat away to Plymouth Raiders, where he scored 12 points in 21 minutes of play, picking up 10 rebounds.
After just one season in Newcastle, it was officially announced on August 1,  that Dorsey had penned a contract with Eagles' title rivals Guildford Heat for theone season, in which they played in the ULEB Cup. After just one year with the Heat Dorsey joined Everton Tigers in 2008, with Heat team-mate James Jones.
- 2008–present Everton Tigers
- 2007-2008 Guildford Heat
- 2006-2007 Newcastle Eagles
- 2005-06 Fileni Bpa Jesi
- 2005 Eurorida Scafati
- 2002-05 Telindus Oostende
- 2001-02 Cholet Basket
- 2000-01 Hapoel Jerusalem
- 1998-00 Manchester Giants
- 1996-98 Birmingham Bullets
- 1996 Steiner Bayreuth
- 1994-96 Birmingham Bullets
- BBC (2006). "Eagles grab Dorsey for BBL return". BBC Sport. Retrieved 2006-11-21.