Porsche series

In 2015, Cullen performed double-duties, partaking in the Porsche Carrera Cup Great Britain with G-Cat Racing whilst also racing for VERVA Lechner Racing Team in the Porsche Supercup from round 4 onwards. He scored a best race finish of eighth in the former and 12th in the latter.

After finishing third in the Porsche GT3 Cup Challenge Middle East during the off-season, the Irishman returned to the Porsche Supercup with Lechner Racing whilst also competing in the Porsche Carrera Cup Germany at Konrad Motorsport. In the latter, Cullen finished tenth in the standings, being beaten by all full-time drivers, meanwhile he classified 11th in the Supercup with a best result of seventh at the Red Bull Ring.^[9]

For his third season in the Porsche world, Cullen remained with Lechner in the Supercup, but switched to Huber Racing in the PCCG.^[10] He would end up 11th again in the former, whilst improving to ninth place in the latter's standings.

LMP2 venture

Cullen switched to prototype racing in 2018, driving in the LMP2 class of the European Le Mans Series for APR - Rebellion Racing alongside Gustavo Menezes and Harrison Newey.^[11] The team ended up ninth in the standings, having finished all six races.

At the start of 2019, Cullen took his maiden endurance racing victory in the 24 Hours of Daytona, having driven for DragonSpeed together with Pastor Maldonado, Roberto González, and Sebastián Saavedra.^[12] For the main 2019 season, the Irishman remained in the ELMS, this time partnering Alex Brundle and Will Owen at United Autosports.^[13] Cullen and his teammates scored their first podium of the year at Monza, finishing third, but were unable to match the results of the sister car, finishing eighth in the teams' championship.^[14] Cullen made his 24 Hours of Le Mans debut the same year, finishing 14th in class.^[15]

Without a full-time programme in the COVID-stricken 2020 campaign, Cullen had to make do with one-off appearances. He raced in two races of the ELMS with DragonSpeed, drove for Jackie Chan DC Racing at the 6 Hours of Spa-Francorchamps, and competed at Le Mans for G-Drive Racing.^[16][17]

Cullen underwent another patchy season during 2021, as he raced in two events of the FIA World Endurance Championship with Risi Competizione, which included another appearance in Le Mans - where he and his teammates retired due to engine troubles.^[18]

The following year saw the Irishman step into the WEC for the entire season, as he drove with new team Vector Sport in the LMP2 category.^[19] Despite scoring a podium at Monza, Cullen and the team struggled, ending up tenth and second-lowest of the Pro class entries in the standings.^[20][21]

Returning for the team's second season in the category, Cullen partnered Gabriel Aubry as well as fellow silver-ranked driver Matthias Kaiser for the 2023 WEC season.^[22] With numerous technical issues and a collision at Monza, Vector Sport finished tenth overall, once again ranking second-lowest. However, a strong drive by Aubry carried the team towards a seventh place in class at Le Mans.^[23][24]

Racing career summary

† As Cullen was a guest driver, he was ineligible for championship points. ^* Season still in progress.

Complete British Formula Ford Championship results

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

Complete GP3 Series results

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

Complete Porsche Supercup results

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

Complete European Le Mans Series results

^‡ Half points awarded as less than 75% of race distance was completed. ^* Season still in progress.

Complete IMSA SportsCar Championship results

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

Complete 24 Hours of Le Mans results

More information Year, Team ...

Year	Team	Co-Drivers	Car	Class	Laps	Pos.	Class Pos.
2019	United Autosports	Alex Brundle Will Owen	Ligier JS P217-Gibson	LMP2	348	19th	14th
2020	G-Drive Racing with Algarve	Oliver Jarvis Nick Tandy	Aurus 01-Gibson	LMP2	105	DNF	DNF
2021	Risi Competizione	Oliver Jarvis Felipe Nasr	Oreca 07-Gibson	LMP2	275	NC	NC
2022	Vector Sport	Sébastien Bourdais Nico Müller	Oreca 07-Gibson	LMP2	357	27th	22nd
2023	Vector Sport	Gabriel Aubry Matthias Kaiser	Oreca 07-Gibson	LMP2	325	15th	7th

Close

Complete FIA World Endurance Championship results

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