Who was captain for Team Discovery Channel, when Tour de France started in 2007?

Explanation

Levi Leipheimer (born 1973) is an American professional cyclist. He has previously been on Teams Gerolsteiner, Discovery Channel and Astana, and came to Team RadioShack in 2010. In Tour de France 2007, he captained Team Discovery Channel, but his water bearer, Alberto Contador, was much stronger in the mountains. Contador won Tour de France for the first time that year.