His main responsibilities are overseeing the Knight faceoff unit, riding, clearing, and substitution box. Ondrusek helped the faceoff unit improve its winning percentage by 11% in 2022 compared to 2021. Faceoff specialist Aidan Fearn was also named to the 2022 ASUN All-Freshman Team.

Ondrusek came to Bellarmine in 2021 by way of Division III Whittier College in Los Angeles, CA. During his time at Whittier College, Coach Ondrusek served as an assistant coach and defensive coordinator for four seasons. The Poets had an overall record of 21-11 including a 13-3 record in 2019, which broke the school record for single season NCAA wins. The team finished in the top 25 nationally for seven statistical categories that year, including groundballs per game (18th) and caused turnovers (8th). In his first year with the Poets in 2018, Ondrusek coached a defense that finished first statistically for caused turnovers.

Originally from Lancaster, PA, Ondrusek attended Bucknell University, where he played in 48 career games while plugging in at short stick defensive midfield, long stick midfield, on face-off wings and on the man down unit as well. Bucknell would finish with a 37-24 record over his four-year career, making him part of the program's winningest class at the time. Ondrusek was a member of a Bucknell team that achieved a national ranking of sixth in the USILA Coach’s Poll, the highest in program history. He was a recipient of the program’s Most Improved Player and Character & Leadership awards while also serving as a team captain.

Ondrusek received a Bachelor of Arts degree from Bucknell University with a double major in economics and political science.