[1] After starting playing professionally in the Atlantic Basketball Association with the Norwich Neptunes,[2] Closs moved to the Clippers in 1997.

Closs played three seasons as a backup center for the National Basketball Association's Los Angeles Clippers from 1997 to 2000, averaging 3.9 points, 2.9 rebounds and 1.3 blocks per game during his spell.

[3] Closs played for the Butte Daredevils in the CBA during the 2006–07 season but was released after being arrested for public intoxication.

[7] In December 2008, Closs signed with the Chinese league's Yunnan Bulls, and averaged 16.1 points, 11.9 rebounds and 5.9 blocked shots per game.

[6] On July 21, 2023, Closs was announced as the head coach of the Santiago Basket Titanes in the Dominican Laliga de Campeones.