He holds the North American U20 record in the 1500 meters, having run 3:34.36 in 2021 during his senior year in high school.

However, wanting to keep a non-professional relationship with his son, he had the renowned University of Michigan coach Ron Warhurst plan most of Hobbs' training.

[2] On February 7, 2021, Kessler broke the U.S. high school indoor mile record by running 3:57.66 at the Randal Tyson Track Center where he placed third in the race.

[4] During the outdoor track season, he went on to run 8:39.04 for 2-miles at the NSAF USA Meet of Champions in Myrtle Beach, becoming the No.

Only a day before he competed at the U.S. Olympic Trials in June 2021, Kessler turned professional, signing with Adidas.

[8] Kessler currently trains under the tutelage of Ron Warhurst in Ann Arbor as part of the Very Nice Track Club.

His training partners include Olympians Bryce Hoppel, Nick Willis and Mason Ferlic, as well as other professional runners Ben Flanagan, Morgan Beadlescomb, Nathan Mylenek, Natalie Cizmas, Alsu Lenneman, and Charlie Da’Vall Grice.

[12] On February 11, Kessler placed second to Yared Nuguse in the Wanamaker Mile at the Millrose Games, in a personal best time of 3:48.66.

At the 2024 World Indoor Championships, in the 1500 meters, Kessler ran at the front of the field for the majority of the race before getting out kicked by Cole Hocker and Geordie Beamish as he finished in 3rd for the bronze medal.

His compatriots Yared Nuguse and Cole Hocker finished 3rd and 1st respectively, marking the first time in 112 years that two Americans were on the men's 1500 meter podium.