Tretter was a second-team Associated Press All-American at the Football Championship Subdivision as a senior at left tackle. He was responsible for protecting record-breaking quarterback Jeff Mathews' blind side and allowed the Big Red to set new Cornell and Ivy passing records in his two seasons there. A preseason honorable mention FCS All-American by Beyond Sports College Network, he was part of a line that allowed the passing game to pile up 3,748 yards, a mark that ranked third in the FCS in 2012. He started each of his final 20 games at left tackle and is the first offensive lineman to earn first-team All-Ivy honors since Kevin Boothe in 2005. Tretter lettered his first two seasons as a tight end, even catching a touchdown pass as a sophomore at Columbia. He was taken with the 25th pick of the fourth round (122nd overall) by the Green Bay Packers in the 2013 NFL Draft.
