Olivier Vidal, former assistant to the general manager of the Hagerstown Powertrain Operations, is the new general manager.
Vidal, 38, joined the local plant in 1996.
As general manager Vidal is responsible for all aspects of manufacturing in Hagerstown.
Vidal came to Mack from its parent company, Renault V.I., where he served most recently as director of quality for the mechanical components division, Mack officials said.
Previously, Vidal was production manager of Renault V.I.'s Limoges plant. He also spent four years as quality manager of the Venissieux engine plant.
Vidal holds an engineering degree from Ecole Centrale de Paris and a finance degree from Paris University.
Washington County Commissioner Ronald L. Bowers, who works in the shipping and receiving department at Mack, said he believes Vidal will be very interested in the inner workings of local and state government, and how it relates to Mack.
"I can say as a Mack worker that Olivier will be very pro-community. Hopefully, we'll extend a warm Washington County welcome to him," Bowers said.