Hillson is from Mansfield, Pa. and played baseball at Mansfield University. In 2016, he started all 46 games at shortstop.Hillson led Mansfield in batting average hitting .372 while scoring 33 runs, recording 13 doubles and 24 runs batted in. For his career,Hillson batted .323. Noted for his defense,Hillson had a .921 fielding percentage in his career at Mansfield. In 2018, Hillson appeared in 20 games for the Otters, recording ten runs, six RBIs and 11 walks while collecting 11 hits. Defensively, Hillson saw time on the left side of the infield and in the outfield for the Otters, posting a .955 field percentage. On the mound, Hillson made an appearance in last year’s regular season finale at Normal. He pitched 3.1 innings, giving up two unearned runs and allowing two hits.