Graham Rahal is an American race car driver and small business owner. He currently races in the IndyCar Series with Rahal Letterman Lanigan Racing, a team partially owned by his father Bobby Rahal, the winner of the 1986 Indianapolis 500. Certificate of Authenticity from Athlon Sports Collectibles. This is a Graham Rahal signed Indianapolis 500 Indy Car Series 8.5x11 Photo. Certificate of Authenticity from Athlon Sports Collectibles.