Beginning karting for fun after breaking his leg on a bike, Jack advanced to racing competitively and claimed multiple State Title Wins in Australia and impressed at the World Karting Titles.
Jack moved overseas to follow his dream of driving in Formula 1 and took a massive step-up into the British Formula 4 Championship where he claimed a podium on his debut and later finished 5th overall, as well as securing the Rookie Cup.
Jack then advanced to racing in the Euroformula & Asian Formula 3 Championships concurrently where he claimed multiple podiums and race wins in each. Jack entered a second season of the Asian Formula 3 Championship after finishing runner-up but was robbed of the 2019 Championship when tyre failures plagued him in the final round and he was unable to finish two races.
In 2020, Doohan signed with HWA RaceLab for the FIA Formula 3 Championship but struggled with technical issues and regular collateral damage on track. Heading into 2021, Doohan is confident in his race program after post-season testing with Trident Race Team and topping the times across the two-day outing.