Who won two stages in Tour de France 2008, but later tested positive for doping?

Explanation

Stefan Schumacher (born 1981) is a German, professional cyclist. He started his professional career with Team Telekom. Schumacher won the 4th and 20th stage of Tour de France 2008, but after the race he tested positive for doping and thus had his victories deleted. He returned to cycling in 2011 after his quarantine expired.