Rob Smedley believes Formula 1 could see the best of Felipe Massa this season as he has been "given the freedom of head-space" at Williams.
After eight seasons with Ferrari, Massa parted ways with the Scuderia at the end of 2013.
That brought to an end a chapter in the Brazilian's career that included 11 race wins and a runner-up result in the 2008 World Championship.
2008, though, was also the last season Massa won a grand prix with his support at Ferrari deteriorating along with his results.
Moving to Williams for this season, Massa has already hailed the swap on several occasions, saying it has reinvigorated him.
And that is a sentiment echoed by Massa's former race engineer, Smedley, who followed him to Williams.
"I know Felipe Massa very well - I know him inside out," Smedley told Autosport.
"He's a very, very good driver and he's been given the freedom of head-space here to do what he's paid to do, and he's delivering.
"I see Felipe now very relaxed, incredibly experienced, there's a maturity about him and he carries that very well.
"He understands that the job he has to do here is not just about driving the car, it's about driving the people as well.
"He knows how to do that. He's had some very good teachers in that area - I would cite Michael Schumacher as one - and now his time has come.
"He's picked up the baton very well."