Williams has signed up Ferrari's former chief aerodynamicist Dirk de Beer ahead of the start of the 2017 season.
De Beer will join Williams as the team's new head of aerodynamics and is due to start in the role on March 1. After success at Renault and Lotus working under James Allison, de Beer moved to Ferrari along with his former boss in 2013 but, like Allison, left Maranello following last summer's technical reshuffle.
"I am extremely pleased to be joining Williams," de Beer said. "The team has an incredible heritage in Formula One, and I'm proud to now be a part of that. I'm looking forward to working with Dave Wheater and the Williams aero team to help continue driving forward the development of the car throughout the season and beyond. I would like to thank Williams for giving me this opportunity."
Deputy team principal, Claire Williams added: "We're delighted to have someone with Dirk's vast experience joining us. Having spent several years as a Head of Aerodynamics in Formula One, his knowledge and technical expertise will undoubtedly be a great asset to the team in our continued push to restore Williams to the front of the grid."
De Beer is among a number of high-profile recruitments at Williams this year, including the anticipated arrival of former Mercedes technical boss Paddy Lowe and the appointment of Dave Redding as sporting manger from McLaren.