After participating in an on-track Mario Andretti Racing Experience at Charlotte Motor Speedway, Mosack began his racing career in 2017 in the INEX U.S. Legend Car ranks. Entering his first full season in 2018 at the age of nineteen, the young driver needed just four races to earn his first victory, taking the fourth of five events in the 2018 Winter Nationals at Florida’s Citrus County Speedway.
Racing in the Semi-Pro and Open Divisions, Mosack competed at North Carolina’s Concord Speedway, the Summer Shootout Series at Charlotte Motor Speedway and Las Vegas Motor Speedway among other events. In 42 starts, Mosack earned twenty victories, 34 top-fives and 37 top-ten finishes. Among those was a sweep of the National events at Las Vegas, including the Road Course World Finals and Asphalt Nationals.
In 2019, Mosack raced Late Models at Hickory Motor Speedway, finishing third in points and taking top rookie honors. He earned seven top-five and 25 top-10 finishes in 27 starts at the venue.
In 2020, Mosack signed with JR Motorsports to run full-time in the CARS Tour, he was able to pick up 3 Top 5's, 8 Top 10's and Rookie of the Year honors as he finished 6th in points in a season shortened to only 10 races due to the COVID-19 pandemic. His performance earned him a spot in the Drivers Edge Development Program presented by Chevrolet, an elite program selecting only six drivers for mentorship and development.
In 2021, Mosack would have a reduced Late Model schedule only running 3 races in the CARS Tour and also running the Snowball Derby in addition to a few regional events.
In 2022, Mosack only ran three races again in the CARS Tour.
In 2023, Mosack ran in select Late Model races in addition to his NASCAR and Trans-Am schedule.[citation needed]
Mosack was tapped to drive the No. 02 for Young's Motorsports on May 10, 2021, for three ARCA Menards Series races that year. Mosack would first make his debut at the 2021 Henry Ford Health System 200, ultimately retiring due to a fuel pump problem and finishing 16th.[1] He would make two more starts that season, finishing with a best of eleventh at the 2021 Reese's 150.
In 2023, Mosack joined Joe Gibbs Racing for a six-race slate, running at larger tracks where their primary driver, William Sawalich, was unable to race at due to his age.[3] Mosack scored his first career ARCA win at Kansas Speedway, holding off Carson Kvapil in the final few laps.[4] Mosack followed up with his second ARCA win at Kansas driving for his family owned team.
Mosack competed in a full season of Trans Am in the TA2 class for Scott Lagasse Racing in 2021. In fourteen starts, he had ten top-five's, six podiums, and two wins at Watkins Glen. He competed for another full season in 2022.[citation needed]
Mosack returned to Sam Hunt Racing in 2023, running a majority of the season in the team's No. 24 car.[8] He also returned to JGR for three races in the No. 19, with two races ending in DNFs.[9] Mosack ran 24 races and earned a best finish of 5th at Watkins Glen. He ended the season 28th in points.
In 2024, it was announced that Mosack would run a partial schedule with Niece Motorsports in the No. 45 Chevrolet.[11] Later that same year, it was announced that Mosack would also run additional races with Spire Motorsports.[12] Across nine starts in 2024, Mosack finished with one top-five finish, four top-ten finishes, and a podium finish at Homestead-Miami Speedway.
On December 3, 2024, McAnally-Hilgemann Racing announced that Mosack would drive their No. 81 truck full-time in 2025.[13] On February 21, 2025, Mosack scored his first career NCTS pole for the race at Atlanta.[14]
(key) (Bold – Pole position awarded by qualifying time. Italics – Pole position earned by points standings or practice time. * – Most laps led. ** – All laps led.)
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