Kellen is signing with Northeastern Oklahoma A&M College. Kellen is a 2 year letterman for the Bronco Baseball program as a pitcher. Kellen has seen his role on the mound grow over the past season, as he has been both a starting pitcher and reliever for the Broncos, recently earning his first save of the season in the series opener against Red Oak. For the season, Kellen has a 1.18 ERA, and has allowed a batting average against of only .183.