Christian Klien, current Red Bull Racing F1 driver.
It was actually very difficult to pan here - surrounded by people and some very quick moving karts. Even at 1/180s you can see the sensation of speed.
This photo was taken at the Red Bull Track Attack event, a karting event sponsored by Red Bull. It was a very well organised event, and featured many celebrity racers and current Formula 1 drivers. I was fortunate in that I live just five minutes walk from the event. Please contact me if you wish to see the other photos from this event (I took many!).
See this location in....
(Google Earth must be installed)