Veteran IndyCar race engineer Bill Pappas has joined Rahal Letterman Lanigan, where he will oversee Graham Rahal's car.
Pappas' 25-year career has included stints at Roush Racing, Chip Ganassi Racing, Hall Racing, Walker Racing, Panther Racing, and most recently Dale Coyne Racing, where he spent the past two seasons working with Justin Wilson.
He engineered Gil de Ferran to CART rookie of the year honours in 1995, and supervised Juan Pablo Montoya's Indianapolis 500 win in 2000.
"I'm excited that Bill is joining the team," said Rahal. "He brings not only a wealth of experience, and Indy 500 wins as well as others, he can really help take our team and engineering staff to the next level.
"I've known Bill a long time. We have had opportunities to work together before but it just didn't fall into place until now."
The arrival of Pappas marks the second tweak to RLL's engineering staff in a little over three months.
Rahal started the year with Gerry Hughes as his race engineer, with Neil Fife taking over in late July after Hughes was moved to a new role as the team's head of development.
A second place on the Long Beach street course was the highlight of an otherwise disappointing year for Rahal, who finished the season 18th in the standings.