If you never heard of him, please don't say "I know car business". Unfortunately, you don't. It is like, saying who is Bill Gates during an interview in Microsoft! No difference.
Mr.Piëch is grandson of Ferdinan Porsche, so he has the car DNAs in his blood. And his talent to turn VW from peoples' boring car into automotive giant. Bentley and Bugatti missions were Piëch's ideas. And if you love Veyron, you should thank him. Also he is very good at business game, his cousin Wolfgang Porsche started to buy VW bit by bit for quite long time and Piëch made the right movement at the right time and Porsche is a brand of VW. Now VW has these; VW, Audi, Porsche, Bugatti, Bentley, Skoda, Seat, MAN and Scania. VW has only have stakes in MAN and Scania. Also he has shaped the design of Porsche Panamera.
So he is the Bill Gates or Alexander the Great of automotive industry :) With this interesting pictures attached to his jacket. I found this on Top Gear Magazine's December 2009 issue at page 112.
