NBA (2001–2012) Between
2001 and
2005, Demopoulos served as an assistant to
Nate McMillan at the
Seattle SuperSonics in the
NBA. After five seasons with the Trail Blazers, Demopoulos was hired as an assistant to
Vinny Del Negro at the
Los Angeles Clippers in
2010. He served under Del Negro for all three of his seasons, with Demopoulos leaving the Clippers in
2013.
Melbourne United (2015–2017) In April 2015, Demopoulos was hired by
Australian NBL club
Melbourne United to be head coach on a two-year deal. 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. He was subsequently named NBL Coach of the Month for October 2015. In
2016–17, Melbourne failed to make the finals despite boasting a bevy of stars. They entered the final round of the season in third place His contract was subsequently not renewed following the 2016–17 season.
Grand Rapids Drive (2018–2019) Demopoulos spent the 2018–19 season as an assistant to Ryan Krueger at the
Grand Rapids Drive of the
NBA G League.
Saskatchewan Rattlers (2022–2023) On January 19, 2022, Demopoulos was announced as the new head coach of the
Saskatchewan Rattlers of the
Canadian Elite Basketball League (CEBL). However, he was fired on July 4, 2023. ==Head coaching record==