Turnbull was appointed the head coach of the JCC women's basketball program in the summer of 2021.

During his first season at the helm, Turnbull coached a representative on the NJCAA Diviison II Women's Basketball All-America Teams, the NJCAA Region 3 Player of the Year, three NJCAA Region 3 All-Region players, two NJCAA Region 3 All-Tournament honorees, as well as being named the NJCAA Region 3 Coach of the Year. Turnbull coahced the team to an overall record of 13-15 and a berth into the NJCAA District East Semifinals where they fell to the No. 1 seeded Union County College. The Jayhawks went 3-3 during conference action and finished second in the regional tournament.

Turnbull's team stacked up well against other teams across the country, finished tied for 10th in rebounds per game with 47.7 and tied for 15th in blocks per game with 4.1. 

Turnbull comes from the high school ranks where he has had great success in short periods of time. Most recently, Turnbull captured two Section VI Class B-2 title in four years at Southwestern Central School. In his four years with the Trojans, Turnbull posted a record of 71-24 while being named to the 2019 Post-Journal Coach of the Year.

Prior to Southwestern, Turnbull spent two seasons at Maple Grove High School where he took his team to one Section VI Class D Championship game. During his time at Maple Grove, Turnbull compiled a record of 24-16 and was also named the Chautauqua-Cattaraugus Athletic Association Coach of the Year in 2014.

Prior to his high school coaching career, Turnbull has spent his summers since 2010 as a camp instructor at the University of North Carolina at Chapel Hill alongside Women's Basketball Hall of Famer and fifth-most winningest coach in NCAA women's basketball, Sylvia Hatchell of the Tar Heels.

A native of Jamestown, Turnbull completed his Juris Doctor at the Syracuse University College of Law in the fall of 1989. Prior to Syracuse, Turnbull received his Bachelor of Arts in Political Science at the University of North Carolina at Chapel to go along with his Associates of Arts in Political Science right here at Jamestown Community College.