Upon graduating in 2009, Arseneault started as an assistant coach under his dad at Grinnell in the fall of the same year. He also played one year in a semi-professional league in Germany with
TV Hohenlimburg. Arseneault was named the interim coach starting in the second semester of the 2011–12 season while the elder Arseneault was on
sabbatical leave. He was named an associate head coach in the 2012–13 season.
The Express-Times that season wrote that Arseneault "essentially runs the program." In 2013–14,
Rick Reilly of
ESPN wrote that Arseneault "does the coaching" while his father "watches three feet from the far end of the bench, sometimes with his granddaughter on his lap." Arseneault was also an assistant coach for women's and men's
golf at Grinnell, as well as an assistant
softball and
American football coach. He planned to run a modified version of the Grinnell System, and called the upcoming season an "experiment". Limited to a 10-man roster and subject to the D-League's high roster turnover, Arseneault adjusted the system, abandoning its
hockey-style substitutions and
full-court press. He coached two years with Reno, leading the league in scoring in both seasons while compiling a 55–47 overall record. The team was 33–17 in 2015–16, which was one win short of the franchise record. After the season, Arsenault's contract was not renewed. Arsenault returned to Grinnell as their interim head coach for 2016–17, when his father was scheduled to be on another sabbatical leave. He became the Pioneers' head coach after the elder Areseneault retired in June 2018. ==References==