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.[2][3] He was named Wisconsin Intercollegiate Athletic Conference (WIAC) Offensive Player of the Year for 2014.[4] Behrendt earned Division III All-American honors while in college.[5]
Behrendt also lays claim to the two longest streaks of consecutive attempts without an interception (388 in 2013–14 and 225 in 2012–13) in school history. Behrendt claimed the records for most completions and touchdown passes in school history prior to his final game with the Warhawks. While at Whitewater, Behrendt was roommates with Jake Kumerow.[6]
After going undrafted in 2015, Behrendt was invited to rookie minicamp by the Minnesota Vikings.[8] However, he was not signed to a contract. He also took part in the local pro day held by the Chicago Bears.[9]
Colorado Ice
Behrendt signed with the Colorado Ice of the Indoor Football League, playing in 3 games near the end of the 2015 Indoor Football League season. His jersey number was 2, the only time Behrendt has not worn number 16. His professional debut was also his first start for the Ice against the Nebraska Danger; the Danger defeated the Ice, but Nebraska head coach Mike Davis commented, "Tonight they did some things on us early - that Behrendt kid is going to be a force."[10] By the end of the season, Behrendt threw for 243 yards and three touchdowns to five interceptions, and also caught one pass for 12 yards.
Green Bay Blizzard
Behrendt returned to Wisconsin to play for the Green Bay Blizzard the following two IFL seasons. Neither year resulted in a playoff berth, although his first season contained success, winning IFL Player of the Week for weeks 12 and 15,[11] and also tying for the league lead in touchdowns passes with 63. 2017 in particular was a difficult year; Behrendt finished 2017 on injured reserve, and the Blizzard ended up with a record of 3–13. Behrendt spent 2018 out of football.
Tucson Sugar Skulls
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. Behrendt began the season as the starter, and won an early Player of the Week award after throwing 8 touchdowns in a game,[13] but ended up splitting reps with Jake Medlock as the season progressed, with Medlock getting the nod in the playoffs. 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. With the 2020 Indoor Football League season cancelled, it was the last snap Behrendt played.