Longtime General Motors executive Ed Peper, most recently at the helm of the automaker’s fleet business, will retire Sept. 1.

Peper, 61, spent 39 years with GM in a variety of sales and marketing roles, including for Cadillac and Chevrolet. He spent more than a decade leading GM Fleet as its U.S. vice president before becoming U.S. vice president of GM Envolve, the automaker’s new fleet and commercial business unit launched in May.

He began his GM career in 1984, working as a district sales manager for Cadillac, before moving into other management roles in sales and marketing. He was Chevrolet’s vice president and general manager from 2005 to 2009 and Cadillac’s general sales manager from 2009 to 2011 before taking over GM’s fleet business in 2012.

“GM and its leadership have been wonderful to me and have given me tremendous opportunities to grow businesses,” Peper said in a statement. “I loved working with our dealers and customers, and I am so grateful for this amazing career.”

Sandor Piszar, GM Canada’s vice president of sales, service and marketing, will succeed Peper at GM Envolve starting Aug. 1. Piszar, 51, will report to Steve Hill, GM’s vice president of commercial growth strategies and operations.

Before his role with GM Canada, Piszar was marketing director for Chevrolet trucks, as well as GMC, and director of performance and accessories within the automaker’s performance vehicle and motorsports group.