Willi Berchtold to hand over his post as Chief Financial Officer of ZF Friedrichshafen AG to Dr. Konstantin Sauer on May 1 2010Konstantin Sauer (50) is currently Executive Vice President of ZF Lemförder GmbH, where he is Head of Finance, Controlling, Information Technology and Materials Management Friedrichshafen, Germany. ZF Group has appointed Dr. Konstantin Sauer as its new Executive Vice President…