Manor Marussia have appointed Dave Ryan as racing director after it was confirmed John Booth and Graeme Lowdon will leave the Formula One team at the end of the season.
Sporting director Lowdon announced his departure on Friday, while team principal Booth - the team's founder - had been heavily linked with the exit door since the Mexico Grand Prix.
The duo's departure is thought to be down to a strained relationship with new owner Stephen Fitzpatrick, who has chosen former McLaren director Ryan as the man to take the team forward.
"I'm very excited to be joining the Manor Marussia F1 Team at a pivotal time in their development," said Ryan, who parted company with McLaren in 2009 amid an investigation into claims Lewis Hamilton lied to stewards at the Australian Grand Prix.
"Having spent time with Stephen and understood his vision for the future, it is clear he has ensured there is a strong platform from which the team can make big steps forward in the seasons ahead.
"Manor has all the hallmarks of a fiercely competitive racing team, but having grown up in a much more contemporary Formula One era, it is a very lean operation with a collaborative culture, which leaves it well placed to contend with the sport's future direction.
"There is clearly a big challenge ahead and a lot of work to do, but I can't wait to meet the wider team and get down to business."
Fitzpatrick added: "I would like to take this opportunity to thank [Booth and Lowdon] for their hard work and dedication during this season in particular. Like every great story, there comes a time to start a new chapter."