Lower formulae

Shehan made his car racing debut in 2021, competing for Crosslink/Kiwi Motorsport in the F4 United States Championship.^[4] He finished 24th in his first season achieving three points finishes.

The following year Shehan returned to the F4 United States series, once again teaming up with Crosslink/Kiwi Motorsport.^[5][6] His campaign started out in a positive manner, as the American scored his first podium in car racing at the NOLA Motorsports Park. After scoring more points at Road America, Shehan took a pair of podiums at the third round in Mid-Ohio. This proved to be the start of a title challenge, with a maiden win coming at New Jersey following a penalty to original winner Lochie Hughes owing to a false start, during a weekend that also included two further podiums.^[7][8] Shehan won again in Race 1 in Virginia and took third place in the following race, which gave him a fighting chance for the championship going into the season finale.^[9][10] However, two points-scoring results proved to be insufficient, with Shehan finishing fourth in the standings. Nevertheless, he had scored sufficient points to help Crosslink secure the teams' championship.^[11]

Formula Regional Ocean Championship

At the start of 2023 Shehan competed in the Formula Regional Oceania Championship with Giles Motorsport.^[12][13] At the season opener held at the Highlands Motorsport Park, Shehan was forced to retire with three laps to go in Race 1, crashing at the Southern Loop during a battle with Jacob Abel.^[14] The American went on to score points in the subsequent pair of races, before taking an eighth place during the first race at Teretonga, allowing him to start Race 2 from pole position.^[15] In a race with wet weather conditions, Shehan was overtaken by Callum Hedge, but managed to hold off the other competitors to finish on the podium for the first time in the category.^[16] Another appearance on the rostrum followed at Manfield with a third place in the second race, where the American benefited from a collision between Louis Foster and Charlie Wurz ahead of him.^[17] Shehan's results tailed off in the final part of the campaign, with him scoring just one more top-ten finish at Taupo to end up tenth in the drivers' standings.^[18][19]

Racing career summary

* Season still in progress.

Complete Formula 4 United States Championship results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Formula Regional Oceania Championship results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Formula Regional Americas Championship results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)