2020-21 – Swam collegiate best times in 100 back (49.40) and 200 IM (1:52.03) at Big Ten Championships… had a season-best time of 1:48.52 at Big Tens.
2019-20 — Swam a collegiate-best in the 200 free (1:48.53) in the dual against Western Illinois (2/7)… had season-best times of 50.13 (100 back), 1:51.15 (200 back), and 1:54.03 (200 IM).
2018-19 – Recorded collegiate-bests in the 100 fly (51.10) and 200 IM (1:51.57) at the Hawkeye Invitational and in the 200 back (1:47.15) against Western Illinois… ranked fourth on the team in the 100 back (50.13) and 200 back (1:47.15).
2017-18 — Swam to career-bests in the 100 free (45.92), 100 back (49.66), 200 back (1:49.12) at the Big Ten Championships.
High School — Swam for the Nitros… received Hardest Worker Award in 2016… top times are: 50.36 (100 back), 1:50.21 (200 back), and 49.68 (100 fly)… earned Academic Honors Award as freshman and sophomore… club coaches were Tim O’Brien, Rob Hastings, and Elliot McGill.
Personal — Born March 1, 1999, in Columbia, Missouri… son of Eric and Ann Rosenkoetter… has two siblings, a twin sister, Olivia, and an older brother, Max… grandfather, Jack Tod, played football at the University of Iowa… majoring in business analytics and information systems.
Rosenkoetter’s Collegiate Bests
| Event | Time | Meet | Date |
| 50 Free | 21.19 | Michigan State | 10/5/17 |
| 100 Free | 45.92 | at Big Ten Championships | 2/25/18 |
| 100 Back | 49.40 | at Big Ten Championships | 3/5/21 |
| 200 Back | 1:47.15 | Western Illinois | 2/1/19 |
| 100 Fly | 51.10 | Hawkeye Invitational | 11/16/18 |
| 200 IM | 1:51.57 | Hawkeye Invitational | 11/15/18 |