George Kostelis is an assistant coach for the Quinnipiac University men's soccer program in Hamden, Connecticut, and is set to begin his third season on Eric Da Costa's staff in fall 2026. He oversees goalkeeper training and was on staff when Karl Netzell earned All-MAAC Third Team honors in 2024 and was named MAAC Defensive Player of the Week on Sept. 16.
Kostelis has more than 20 years of coaching experience and deep ties to soccer in Connecticut. Before joining Quinnipiac, he worked with the Hartford men's and women's programs from 2021 to 2022 and served as director of coaching for Soccer Club of Newington from 2019 to 2021. He was also Hartford Athletic's goalkeeper coach in the USL from 2019 to 2020. Earlier collegiate stops included Rhode Island as associate head women's soccer coach from 2017 to 2018, Southern Connecticut State as a part-time assistant men's coach from 2016 to 2017, Trinity College in 2016, Western Connecticut as head men's coach from 2011 to 2016, Yale as an assistant men's coach from 2001 to 2011, and UConn as an assistant women's coach from 1997 to 2000.
