WEBMar 13, 2010 · Moneypit. Effective immediately, John Medlen, formerly of John Force Racing, has joined Don Schumacher Racing, and will be co-crew chief, with Tommy DeLago, on the DieHard Dodge Charger Funny Car driven by Matt Hagan in the 2010 NHRA Full Throttle Drag Racing Series. A former race car and race boat driver, Medlen is best known as a designer ...