[3] After graduation, Prosser landed his first assistant coaching position at Wofford under Mike Young, where he stayed for one season before heading to Bucknell for a five-year stint as an assistant for Pat Flannery, where he was part of the Bison staff when the team upset Kansas during the 2005 NCAA tournament.
[4] Prosser returned to Wofford in 2008 where he stayed until 2011 when he accepted the head coaching job at Division II Brevard College.
In his second season at Western Carolina, Prosser guided the Catamounts to a 19-12 record as WCU finished with the second-most improved mark across NCAA Division I men's basketball.
The Catamounts reached the SoCon Tournament semifinals for the first time since the 2015–16 season, and had a pair of First Team All-Southern Conference and NABC All-District players in senior forward Carlos Dotson and redshirt junior guard Mason Faulkner.
On April 2, 2021, Prosser's return to Winthrop was made official, as he replaced Pat Kelsey as head coach.