Career Bests
| Event | Time | Date | Competition |
| 100 back | 50.78 | 11/29/18 | Tennessee Invitational |
| 200 back | 1:47.12 | 3/02/19 | Big Ten Championships |
| 100 breast | 1:00.71 | 1/31/20 | Villanova |
| 200 IM | 1:49.92 | 2/28/19 | Big Ten Championships |
| 400 IM | 3:53.80 | 2/28/20 | Big Ten Championships |
Career Accolades
- Scored at the Big Ten Championships in the 400 IM.
- Academic All-Big Ten (2020).
2019-20 (Sophomore Year)
- Awards: Academic All-Big Ten.
- Big Ten Championships (2/26-2/29): Scored in the 400 IM, placing 24th with a personal-best time of 3:53.80.
- St. Bonaventure (10/4): Placed fourth in the 50 back (24.86).
- Big Al Invitational (12/6-12/8): Set two season bests, finishing fourth in the 200 back (1:48.11) and 12th in the 400 IM (3:56.38).
- Villanova (1/31): Placed third in the 200 back (1:52.46).
2018-19 (Freshman Year)
- Big Ten Championships (2/27-3/2): Earned season bests in the 200 IM (1:49.92), 400 IM (3:54.13) and 200 back (1:47.12).
- Tennessee Invitational (11/29-12/2): Placed seventh in the 400 IM (3:56.12).
- at Navy/vs. North Carolina: Placed fourth in the 200 back (1:52.05).
- West Virginia (1/18): Placed third in the 200 back (1:51.82).
- Bloomsburg (1/19): Finished first in the 200 breast against (2:10.19).
- Villanova (2/1): Placed third in the 100 breast (1:01.11) and 200 back (1:52.60).
High School
- Earned four letters swimming the backstroke and IM at Providence H.S. under head coach Bill Davis.
- Team captain as a senior.
- State finalist in the 100 backstroke.
- Named to all-conference team in 2017.
- Helped team to a conference championship and fourth-place finish at the NCSAA 4A State Championships in 2017, also contributing to a pair of third-place relay efforts (200 IM and 400 free) at states.
- Earned a pair of runner-up finishes in the 200 IM and 100 back at regionals.
- Swam for SwimMAC Carolina where he was part of the largest group of Scholastic All-Americans (32).
- Part of the SwimMAC national team that won Summer Juniors (2017).
- National Art Honor Society member.
- Taught youth swimming.
- Painted large murals at middle school and at SwimMAC.
Personal
- Full name is Theo Anthony Perelli.
- Parents are Michelle and David Perelli.
- Has an older sister, Megan.
- Plans on majoring in architectural engineering and wants to design mansions.
- Hobbies include art, building information modeling and listening to vinyl records.
- Born October 7, 1999 in Sacramento, California.