Dr. Robert F. Dieli Presents the Outlook for Heavy Duty Aftermarket Dialogue by Robert Dieli | Jan 25, 2016 | No Spin News | 0 comments Dr. Bob Dieli presented the outlook for the truck economy at the Heavy Duty Aftermarket Dialogue as part of the Heavy Duty Aftermarket Week in Las Vegas. Pictured (left to right): Erick Zahrai, Stu MacKay, Dave Kalvelage, and Bob Dieli.