Lotus deputy technical director Naoki Tokunaga is to leave the team so he can take up a position as technical director of Renault's 2014 engine project.
Tokunaga originally joined what was then the Benetton team in 2000 as a vehicle dynamics engineer, before being promoted to head of control systems in 2002 and then deputy technical director in 2010. The role of deputy technical director will not be filled for the foreseeable future.
Lotus technical director James Allison said: "While we are sad on a personal level to see Naoki leave Enstone, we believe this move will be overall positive for Renault Sport F1's customers.
"We would like to thank Naoki for the tremendous contribution he has made to our team during the 12 years he has been with us and we look forward to the performance he will bring us (and all of Renault Sport F1's client teams) in his new role."