In 1983, Demopoulos became an assistant to John Chaney at Temple University,[2] a post he held until 2000.[3] During that span, the Owls became a national basketball powerhouse, amassing a 393–151 (72.2%) record and making it to the NCAA Tournament 16 times and to the Elite Eight on four occasions.[1]
For the 2000–01 college season, Demopoulos served as head coach of the Kansas City Roos men's basketball team.[3] In his one season as coach, the Roos were ranked in the top 10 nationally in several statistical categories, including fewest turnovers (9.5 per game) and scoring defense (60.5 points per game).[1]
In April 2015, Demopoulos was hired by Australian NBL club Melbourne United to be head coach on a two-year deal.[6] He guided United to a 9–0 record to begin the 2015–16 season, which saw him set the best start to a debut head coaching season in league history.[7] He was subsequently named NBL Coach of the Month for October 2015.[7] Melbourne finished the regular season in first place with an 18–10 record, but went on to lose 2–0 to the fourth-seeded New Zealand Breakers in the semi-finals.[8]
In 2016–17, Melbourne failed to make the finals despite boasting a bevy of stars.[9] They entered the final round of the season in third place[9] but lost both of their games, which saw them finish in sixth place with a 13–15 record.[10] His contract was subsequently not renewed following the 2016–17 season.[10][11]