Bell resigned from his position last December and will officially depart to pursue new challenges outside the company in November 2014.
He has held the position of technical director at the Brackley-based outfit since April 2011, having previously worked at a number of different F1 teams including McLaren, Jordan and Renault.
Executive director (technical) Paddy Lowe will assume the responsibilities previously held by Bell as the team looks to streamline its technical organisation.
The technical director role at Mercedes will not be replaced.
Image courtesy of Octane Photographic