Since 2005, Horner has served as team principal and CEO of Red Bull Racing in Formula One, winning six World Constructors' Championship titles between 2010 and 2023.

[4] He competed in the 1992 British Formula Renault Championship with Manor Motorsport, finishing that season as a race winner and the highest placed rookie.

[8] According to Horner, he set the team up with borrowed money, including a loan from his father, and persuaded P1 Motorsport founder Roly Vincini to take on the role of his race engineer.

Horner stayed in F3000 for 1998 and was joined at Arden by Kurt Mollekens, who showed good pace and led the championship at one stage.

During a pre-season test at Estoril, Horner followed Juan Pablo Montoya through the circuit's high-speed first corner and realised that he was "not capable of replicating the level of commitment" shown by the Colombian driver.

As a result, he decided to step back from driving at the conclusion of the season in order to focus on developing the Arden team.

Before the start of that year, Dave Richards' Prodrive organisation bought a 50 percent stake in Arden on behalf of Russian oil company Lukoil, whose boss was Maslov's father.

After parting company with Lukoil, Horner recruited a new driver line-up for 2002 with Tomáš Enge and Björn Wirdheim, who were brought in to replace Manning and Maslov.

[4] By 2004, Horner based his Arden International Team at Prodrive premises in Banbury, before relocating them to the former 22 Motorsport facility close by.

Horner also played a key role in recruiting Adrian Newey, who was announced as the team's chief technical officer in November 2005.

[4] However, the team did take its first podium finish at the Monaco Grand Prix, where Horner jumped into a swimming pool wearing nothing but a Superman cape to celebrate.

[15] On 5 February 2024, Red Bull confirmed that Horner was facing an investigation following allegations of inappropriate behaviour towards a female colleague.

[21][22] Horner and Spice Girls member Geri Halliwell announced their engagement on 11 November 2014[23] and were married on 15 May 2015 in Woburn, Bedfordshire.