As a freshman in 2011, Behrendt backed up to starting quarterback Matt Blanchard as Wisconsin–Whitewater completed a perfect season and won the NCAA Division III Football Championship Behrendt took over as the starting quarterback during his final two years at school, leading the Warhawks to consecutive national championships in 2013 and 2014 and winning the Stagg Bowl Most Outstanding Player Award both years.
Behrendt claimed the records for most completions and touchdown passes in school history prior to his final game with the Warhawks.
After a year off from playing, Behrendt signed with the Arizona Rattlers for the 2019 season, until being a preseason cut due to a crowded quarterback room.
[12] Behrendt then joined another indoor Arizona team, the Tucson Sugar Skulls for 2019, which proved to be his most efficient, albeit in a part-time role.
In his lone professional playoff appearance, Behrendt's only play was a two-yard touchdown rush in a narrow loss to the Sioux Falls Storm.