Australian-born, Diffey has been in the United States for more than 20 years covering everything from Track & Field at the Olympic Summer Games, the Formula One World Championship, Bosbled at the Olympic Winter Games and the Indianapolis 500. His high energy commentary style coupled with a deep love of sports has been well received by the US and international viewing audiences. A sample of Leigh’s Track & Field commentary was recently featured in Google’s “2022 Year in Search” video.

Leigh serves as NBC Sports’ lead play-by-play commentator for its INDYCAR, IMSA Sportscar Championship, MotoGP and Supercross coverage. In addition, he is NBC Olympics’ primary announcer for Track & Field and Sliding sports. He has done five Olympic Games for NBC Sports.

In 2019, Diffey was the lead announcer on NBC’s first-ever broadcast of the Indianapolis 500. NASCAR has also been a part of Diffey’s portfolio. In 2017 Leigh became the first non-American voice to be the Play by Play Announcer on a NASCAR Cup Series race. He has also done NASCAR Xfinity Series races in addition to hosting the NASCAR America studio show.

Versatility is ones of Diffey’s strengths and in his time at NBC Sports since joining in 2013, has worked on the Track & Field World and National Championships, Rowing at the Rio Summer Games, Bobsled, Skeleton and Luge at the Sochi, Pyeongchang and Beijing Winter Games, the Rugby World Cup and Premiership Rugby.

Prior to joining NBC Sports, Diffey served as a host and play-by-play commentator for SPEED Channel in the US, the BBC in the UK and Network Ten in Australia, where he worked on F1, INDYCAR, MotoGP, Golf (including The Masters), World Superbike, World Rally, Sailing and V8 Supercars. He was also a host of Sports Tonight in Australia. Diffey is a native of Brisbane, Australia, and currently lives in Connecticut with his wife and two children. Leigh’s commentary is often utilized in a variety television commercials for capturing the big moment of excitement or historical significance.