|High School:||University Preparatory HS|
Pennington had a phenomenal freshman year qualifying for NCAA Zones in the 1-Meter, 3-Meter, and Platform. His scores from the season in all three events were all school records.
Went to the 2018 USA Diving Zone E Championships his senior year scoring a 388.65 in the 3m and 300.05 in the 1m events. Also finished with scores of 403.95 in the Far Western Diving event and a 386.40 in the 1m Capital Pre Region Invitational as a junior.
Pennington is the son of Troy and Savah Pennington. Mackaby has two siblings: Milo and Dane.