Renault Technical director Nick Chester is departing the Formula One team after a difficult season in charge, the team announced on Friday.
Chester was also placed on "garden leave", a move designed to stop top staff with intimate knowledge of the organisation being immediately employed by a rival team.
Renault said that the move was part of "a major restructuring plan of their UK technical departments."
"The team wishes Nick well for the future and thanks him for his significant contribution to the team's achievements," Renault said in a statement.
The former technical director had been with Renault for 19 years.