A 6 ft 4 in (1.93 m)[1][2] and 211 lb (96 kg)[3] shooting guard, he first gained fame in the U.S. while playing college basketball at Duke University.

He led East Anchorage to the 1994 Alaskan State Championship, and he played in the McDonald's All-American Game, where he won the 3-point shooting contest.

[4] After high school, Langdon moved on to play NCAA Division I college basketball at Duke, where he set the school record for the most career 3-point field goals made (which was broken by JJ Redick in 2006), earning him the nickname, "The Alaskan Assassin".

[6][7] In the 1999 NCAA Men's Division I Basketball Tournament championship game, with Duke down 1 point to the UConn Huskies, with 5.4 seconds to go in the game, Langdon attempted to drive the ball into the lane, and committed a traveling violation that turned the ball over to UConn.

[4] Langdon was selected in the 6th round of the 1994 Major League Baseball draft out of high school by the San Diego Padres, ahead of such eventual All-Stars as Carl Pavano and Plácido Polanco.

Following a three-year career with the Cavaliers, Langdon moved to Europe to play for the Italian League club Benetton Treviso for the 2002–03 season.

The following season, after being waived by the Los Angeles Clippers in the preseason, he originally signed with and briefly played for the Long Beach Jam before he moved to the Turkish League powerhouse Efes Pilsen.

[17] On October 7, 2006, Langdon led his CSKA Moscow team to a 94–75 win over the Clippers, in an NBA Europe Live Tour exhibition game.

[19][20] After graduating from Duke, with degrees in mathematics and history, Langdon played for the USA national basketball team at the 1998 FIBA World Championship, winning the bronze medal.