Williams have signed 21-year-old Briton Alex Lynn as a development driver for the 2015 Formula 1 season, the team has announced.
Lynn, who will also be competing in the GP2 feeder series this year, won the GP3 title in 2014, Williams said his main role would be to help develop the new Mercedes-powered FW37 in the simulator but Lynn will also take part in a day of testing after the Spanish Grand Prix in Barcelona in May.
"Williams has a strong track record in bringing young talent though the ranks and our development driver position is designed to fully immerse new recruits into the inner workings of a Formula One team," said deputy principal Claire Williams.
"As a British team we are always on the lookout for emerging home-grown talent and Alex has caught our eye with his impressive performances in GP3."
Williams have Susie Wolff as their official test driver. The former champions have not named a reserve to race regulars Brazilian Felipe Massa and Finland's Valtteri Bottas.
The team finished third overall last season and are aiming for wins when the championship starts up again in Australia in March.
Speaking about his appointment, Lynn said, "I am extremely excited to be joining Williams, a team with such incredible history and amazing potential. Over the past year the team has made huge strides forward and it’s clear to see their determination to fight for more success in the future."
"I hope that with a strong year in GP2, while also helping to develop the F1 car throughout this season, I can follow in the footsteps of Valtteri Bottas who joined the Williams team in exactly the same Development Driver role."
"Through hard work and determination, he has gone from winning the GP3 title to earning his place as a Williams F1 race driver. Working with people like Sir Frank Williams and Pat Symonds is an incredible opportunity for me."
"There is so much experience here at Williams and I hope to be able to use the knowledge gained from these people to further develop my skills as a racing driver and respected member of this team."
"Everyone has been incredibly welcoming from the outset, we have hit the ground running and I am very excited about the challenges this role offers – particularly my on track activities driving the FW37 in a few months time.”