CAREER BESTS
| Event | Time | Date | Site/Opponent |
| 100 Back | 56.24 | 2/26/21 | Big Ten Championships |
| 200 Back | 2:04.90 | 2/27/21 | Big Ten Championships |
2020-21 (Junior Year)
- Big Ten Championships (2/23-27): Competed in both the 100 and 200 back with personal best times (56.24, 2:04.90).
- Northwestern/Iowa (1/22-23): Placed eighth in the 100 back (56.86) and 10th in the 200 back (2:06.79).
- Michigan State (2/5-6): Finished second in the 100 back (56.74), third in the 50 back (26.72), and fourth in the 200 back (2:06.71).
2019-20 (Sophomore Year)
• Villanova (1/31): Made collegiate debut in the 50 free (25.48) and 200 medley relay.
2018-19 (Freshman Year)
• Did not compete.
High School
- Three-year letterwinner at Bishop Eustace Preparatory School for head coach Mike Parker.
- Three-time first-team All-South Jersey and a second-team pick as a freshman.
- Set school records in the 100 free (52.50) and 100 back (56.06).
- Scholastic All-American.
- Team captain as a senior.
- Swam for South Jersey Aquatic Club
Personal
- Full name is Mackenzie Shea O’Connor.
- Born August 24, 2000 in Cherry Hill, N.J.
- Parents are Allison and Tim O’Connor.
- Has two younger brothers, Gavin and Collin.
- Majoring in science with a biological sciences and health professions option.
- Aspires to be a doctor/surgeon.
- Hobbies include watching Netflix, hanging out with friends, and baking.