After graduating from
Gonzaga College High School, Gasper attended the
University of California, Los Angeles, where he played
college soccer for the
Bruins. As a freshman, Gasper helped UCLA win the
Pac-12 Conference championship and was named to the All-Freshman Second Team. In 2017, Gasper transferred to the
University of Maryland to be closer to his father, who was diagnosed with
small-fiber neuropathy. He helped the
Terrapins win the
2018 national championship, playing every minute of Maryland's 6 College Cup games. While in college, Gasper played with
PSA Elite during their
U.S. Open Cup campaign in 2015, as well as in the
Premier Development League with
FC Golden State Force in 2016.
Professional On January 11, 2019, Gasper was drafted 15th overall in the
2019 MLS SuperDraft by
Minnesota United FC after they traded $50,000 of
GAM to the
Chicago Fire to secure the pick. He missed the first 15 games of the season due to a hamstring injury. He made his debut for Minnesota United on June 8, coming off the bench in a 1–0 loss to the
Colorado Rapids. Gasper ended the regular season with 15 appearances, helping the Loons finish 4th in the
Western Conference to qualify for the MLS Cup Playoffs for the first time in team history. They lost 2–1 in the first round to the
LA Galaxy, with Gasper playing the full match. On September 6, 2020, Gasper scored his first goal for Minnesota United in a 4–0 win over
Real Salt Lake. In a shortened 2020 season due to the COVID-19 pandemic, Gasper finished with 1 goal and 1 assist while appearing in 18 of a possible 21 regular season games as Minnesota finished 4th in the conference. He played every minute of their 3 playoff games to help Minnesota reach the conference finals where they lost 3–2 to
Seattle Sounders FC. Gasper and the Loons were eliminated in the first round, losing 3–1 to the Portland Timbers. Gasper missed the first three games of the 2022 season after picking up a
concussion in preseason. On March 16 he left the team and entered the league's Substance Abuse and Behavioral Health program. He rejoined the team a month later. He made an Open Cup appearance for the Loons and played once for
Minnesota United 2 prior to being traded. He made his Galaxy debut on May 8 as a substitute in a 1–0 win over
Austin FC. He ended the regular season with 17 appearances for the Galaxy, with 8 of them starts. On April 16, 2023, Gasper was claimed off waivers by the
Houston Dynamo. On January 29, 2024, Gasper signed with
Chicago Fire in exchange for the Fire's third round pick in the
2026 MLS SuperDraft. Following the
2025 season with Chicago Fire, Gasper retired from professional soccer. ==International==