Williams has confirmed Rob Smedley, its head of performance engineering, will leave the team at the end of 2018.
Smedley joined Williams in 2014 from Ferrari and helped guide the team to two consecutive third-placed finishes in the contructors' championship. The team has been unable to sustain that form, however, and has slumped in recent seasosn -- this year, its sits bottom of the same table with just four points to its name.
The Englishman is uncertain what his next move will be.
"I have thoroughly enjoyed my time at Williams," Smedley said. "The team has been through great change since I joined in 2014 and it has been a pleasure to have played a part in that.