Montana Western, University of

Sullivan was named the 9th head coach in Montana Western Women's Basketball program history ahead of the 2025-2026 season. Most recently, Sullivan served as the head coach of the girls' basketball program at Sheridan High School in Sheridan, Wyoming. Taking over a team that had managed only five wins across the two previous seasons, he quickly turned the program around. Under his leadership, the team made back-to-back state championship appearances and captured a state title.

Before his tenure in Sheridan, Sullivan coached in Casper, Wyoming, and began his coaching career at Cut Bank High School in north-central Montana.

Sullivan is a proud alumnus of the University of Montana Western and a native of Sidney, Montana. From 2013 to 2018, he competed for both the Bulldog football and men's basketball teams. During his time as a student-athlete, the Bulldog basketball team made consecutive NAIA National Tournament appearances.

Sullivan earned his bachelor's degree from Montana Western in 2018 in social science.