[4] He worked as the Senior Aerodynamicist at Benetton until 1999, when he went to the Jordan Grand Prix team joining them as the head of vehicle technology, after being invited by his former McLaren colleague Mike Gascoyne.

[6][7] Bell was Renault F1's technical director during the hugely successful 2005 and 2006 seasons, in which his R25 and R26 won both the Drivers' and the Constructor's championships.

After the resignations of Flavio Briatore and Pat Symonds in relation to the Renault Formula One crash controversy, Bell was appointed acting team principal for the rest of 2009, on 23 September 2009.

On 14 April 2014, Mercedes announced that Bell had resigned his position in December 2013 and would be leaving the team in November 2014.

[10] Prior to the 2015 Canadian Grand Prix, Manor Marussia announced the recruitment of Bell as technical consultant.