Dumonceaux is in his 20th season on the defensive coaching staff in 2025 after serving as a three-year starter at nose tackle from 2003-05. A 2005 All-American, Dumonceaux received a pair of national awards, Football Gazette's Defensive Lineman of the Year and D3football.com's Defensive Player of the Year, and received the MIAC Mike Stam Award as the conference's top lineman. Dumonceaux and his wife, Patricia, have a son, Fischer, and live in St. Joseph.