[3] Gersich attended Holy Family Catholic High in Minnesota before moving to the United States Hockey League with the Omaha Lancers and the U.S. National Team Development Program (NTDP).

[1] He was recruited to enrol at Holy Family Catholic in the eighth grade by coach Noel Rahn with the aim of leading the fledgeling program rather than joining an established one.

[6] As a freshman at Holy Family Catholic, Gersich accumulated 30 goals and 30 assists and was subsequently offered an opportunity to play with the USA Hockey National Team Development Program for the 2012–13 season.

[8] Although he injured his shoulder during the tournament, Gersich skated with Team Southwest in the Upper Midwest High School Elite Hockey League but sat out the final several weeks of the season.

[13] Following his first full season with the Lancers, Gersich began his collegiate career with the North Dakota Fighting Hawks men's ice hockey team while majoring in communication.

[2] Upon joining the team, Gersich made an immediate impact during their exhibition games as he scored twice in 12 seconds to earn the Fighting Hawks a win over Manitoba.

Following five seasons with the Bears, Gersich as a free agent signed his first contract abroad in agreeing to a one-year deal with Swedish second tier club, Västerås IK of the Allsvenskan, on June 23, 2023.