As a freshman, Mooney served as a backup to
Bonzie Colson. As a junior, Mooney was named to the Third Team
All-ACC and finished second to
Jordan Nwora as the league most improved player. He averaged 14.1 points and 11.2 rebounds per game, though the Fighting Irish finished 14–19 and were last in the ACC. Mooney registered 15 double-doubles in ACC play, including eight straight from January 2 to February 5, 2019. Coming into his senior season, Mooney was named to the Preseason All-ACC team and received three votes for Preseason Player of the Year. After scoring 28 points and grabbing 16 rebounds in a win against
Howard, Mooney was named ACC player of the week on November 18, 2019. On January 4, 2020, Mooney tied his career-high with 28 points and had 14 rebounds in an 88–87 win versus
Syracuse. As a result, Mooney earned his second ACC player of the week honors on January 6. He had his 12th consecutive double-double with 21 points and 13 rebounds in a loss to Syracuse on January 22, breaking
Luke Harangody's school record of consecutive double-doubles. At the conclusion of the regular season, Mooney was selected to the First Team All-ACC. He averaged 16.2 points and 12.7 rebounds per game as a senior. == Professional career ==