Stefan Chellis is a graduate of Mount Saint Joseph in Baltimore City where he was a three-sport athlete. He went on to West Virginia University then National Defense University, Dwight D. Eisenhower School for National Security and Resource Strategy where he hosted lacrosse clinics to teach deployed U.S. Military Services members and their families the game of lacrosse.

He was Head Coach of a Catonsville area boys lacrosse team before moving to Howard County. He has been a Howard County Head Lacrosse Coach for the last 5 years coaching both boys’ and girls’ lacrosse teams. His teams appeared in four straight Championship games winning twice in 2022 and 2024. He was named Howard County Recreation and Parks Lacrosse Coach of the Year in 2023.He is married to wife Amanda, he has three children Maxwell, Violet, and Scarlett. Maxwell (Boys 2030) and Scarlett (Girls 2034) both play lacrosse for HoCo.