In Brenton's four-year career playing for the Stony Brook Seawolves between 2008–09 and 2012–13 (he sat out in 2009–10 with an injury), he played in 127 games scored 971 points and grabbed 1,114 rebounds. He was part of two America East Conference-winning teams in 2011–12 and 2012–13 (three, technically, if one counts his injured season in 2009–10). As a senior, Brenton became just the second Stony Brook player to earn Associated Press (AP) Honorable Mention All-America honors in their NCAA Division I era. That season, he led the team in rebounds (279), assists (158), steals (54), and free throws made (100). Brenton was named the conference's player of the year, its defensive player of the year for the second consecutive season, a first team all-conference selection for the second consecutive season, and CollegeInsider.com named him their national defensive player of the year with the Lefty Driesell Award. He guided Stony Brook to the program's first-ever NCAA postseason tournament victory in 2012–13 with a 71–58 win over UMass in the first round of the 2013 National Invitation Tournament.