Leigh Diffey (born 3 March 1971) is an Australian American auto racing commentator. His career began calling motorcycle races in his home country before moving to the United Kingdom to cover other forms of motorsport. Diffey then moved to the United States to join Speed Channel, while simultaneously working for Network Ten in Australia. Since 2013, he has served as a play-by-play announcer and studio host with NBC Sports in the United States. Early career: Network Ten and BBC Diffey grew up in Queensland, Australia where he briefly raced motorcycles with his friend Daryl Beattie, who eventually became a professional motorcycle racer. Diffey, meanwhile, pursued a career in motorsports broadcasting; his first job came in 1990 at the age of 19, calling Ipswich Motorcycle Club racing at Tivoli Raceway. Diffey also worked as a physical education teacher at Ipswich Grammar School; he left in 1995 to pursue a full-time career in television and sportscasting. Prior to his move to the United States, Diffey commentated on the Superbike World Championship and presented coverage of the World Rally Championship for the BBC in the United Kingdom, working alongside Steve Parrish and Suzi Perry. Additionally, Diffey covered V8 Supercars with Greg Rust, Barry Sheene, Bill Woods and Mark Oastler, as well as Formula One racing, both for Network Ten. He also covered the 12 Hours of Sebring, an event for he would call for a total of ten years. 2003–2012: Speed Channel and return to Network Ten In 2001, Diffey moved to the US to cover the American-based open-wheel racing CART series, while still working for the BBC. Two years later in 2003, Diffey made a full-time move to the States when he was hired by Speed Channel, which later simply became "Speed". At Speed, Diffey was the play-by-play announcer for the network's coverage of the Speed World Challenge, the American Le Mans Series, the Rolex Sports Car Series, the Rolex Grand-Am Cup, the SCCA Trans-Am Series, and a regular anchor of The Speed Report and Speed Center. Diffey occasionally filled in for Speed commentator Bob Varsha during the network's Formula One broadcasts. He also commentated selected rounds of the AMA Superbike and AMA Motocross Championships. Diffey worked with Speed to call several sports car races during his tenure with the network, including the 24 Hours of Daytona and the 24 Hours of Le Mans. While at Speed, Diffey also occasionally returned to