Gunn began his racing career in karting at the age of eight, winning the British Super One MiniMax Championship in 2011 before taking the British Super One Junior Rotax Championship title the following year.[3] In 2013, he graduated to single-seater formula competition, competing in the BRDC Formula 4 series. However, he was forced to miss the final two rounds of the season due to a lack of funding.[4] Scoring two race victories, Gunn finished 11th in the championship.
2021 saw Gunn join Aston Martin customer team Heart of Racing in the IMSA SportsCar Championship.[11] Following the 12 Hours of Sebring, Gunn was confirmed as the full-season partner for Roman de Angelis, with team boss Ian James set to step back to the series' endurance events at Watkins Glen and Road Atlanta.[12] That season, the duo claimed the WeatherTech Sprint Cup title, awarded to the highest performing team throughout the season's sprint events.[13][14] Gunn was victorious in the final race of the season at Petit Le Mans, held at Road Atlanta. 2022 saw Gunn join the team's GTD Pro class entry, paired for the season with Alex Riberas.[15] After a difficult start to the season, featuring retirements at both Daytona and Sebring, the duo scored class victories at Long Beach and Watkins Glen, rebounding to finish fourth in the GTD Pro championship. Gunn returned to the team for the following season.[16]
In 2023, Gunn returned to the British GT Championship, reuniting with Andrew Howard and the Beechdean AMR team.[17] He would make it three full-time programs for 2023 following the announcement of TRG's GT World Challenge America entry, where he partnered with Derek DeBoer.[18] As the team's factory representative, Gunn primarily played the role of initially bringing the team to terms with the Aston Martin Vantage AMR GT3 and coaching DeBoer.[19] Furthermore, he cited his IMSA factory drive as taking the highest priority, as his three-pronged program encountered several conflicting race dates.[19] One of those conflicting dates included the round at NOLA Motorsports Park, during which Gunn was conducting simulator work with the Mercedes-AMG Formula One team.[20]
^Dagys, John (28 April 2023). "NOLA Friday Notebook". Sportscar365. John Dagys Media. Retrieved 29 April 2023. Valentin Hasse Clot is making his GTWC America debut in place of Ross Gunn, who is on Formula 1 simulator duty for Mercedes-AMG this weekend.
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