Dave Ryan has claimed that he is joining Manor Marussia "at a pivotal time in their development".
However, Ryan has warned that there is still a "big challenge ahead" for Manor, as they try to move up the Formula 1 grid.
In a team statement, Ryan said: "Having spent time with Stephen [Fitzpatrick] 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 1 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."
Manor have agreed to run Mercedes engines from next season.