He spent thirteen seasons in the National Basketball Association (NBA) for the Philadelphia 76ers, Milwaukee Bucks, New York Knicks, Chicago Bulls, Phoenix Suns, Los Angeles Clippers and Dallas Mavericks.

[2] Joining a future NBA talent-laden team with Alvin Williams, Jason Lawson, John Celestand and Malik Allen, he filled the void of former Big East Player of the Year Kerry Kittles from the year before and helped lead the Wildcats to a Big East regular season title under head coach Steve Lappas.

Villanova would make the 1997 NCAA tournament but lost in second round to California, which featured future NFL Hall of Famer Tony Gonzalez.

[3] The 76ers would grow impatient with a sophomore slump from Thomas, though, and in 1999 he and Scott Williams were traded to the Milwaukee Bucks for Jerald Honeycutt and Tyrone Hill.

[4] On May 13, 1999, in the deciding game of Milwaukee's first round series versus the Indiana Pacers, Thomas scored 12 points and grabbed 5 rebounds in a 99–91 loss.

On January 5, 2001, Thomas connected on eight three-point field goals in the second half of Milwaukee's 119–115 loss to Portland in which he finished with a career-high 39 points.

[7] During that year's postseason, on April 28, Thomas scored 18 points and grabbed 7 rebounds in a Game 4 win against Tracy McGrady and the Orlando Magic.

[8] The Bucks would ultimately come up short against that season's MVP, Allen Iverson, in a tightly contested Eastern Conference Finals against the 76ers, Thomas' former team.

[10] Upon signing the deal, Bucks owner Herb Kohl said "Tim is a very vital part of this team, and we were willing to take any steps we needed to keep him in town.″[11] On January 11, 2002, Thomas scored 25 points and grabbed 6 rebounds in a 105–86 win against the Washington Wizards.

[18] The incident started a long feud with Nets forward Kenyon Martin, who Thomas called a fake tough guy, that continued past both players' playing careers.

Starting in place of injured All-Star Amar'e Stoudemire (who did not play the entirety of the playoffs), Thomas scored a game-high 22 points with 15 rebounds in a game 1 victory in the first round over the Lakers.

[27] In game 6, Thomas hit the game-tying three at the end of regulation and an important three-pointer late in overtime to seal the Suns' win.

On November 21, 2008, Thomas and Cuttino Mobley were traded to the New York Knicks, in exchange for Zach Randolph and Mardy Collins.

[35] His second stint in Chicago was more successful than his first, as he provided veteran leadership to the young team, helping the Bulls make a late-season push to qualify for the playoffs.