 He also served as co-chief executive officer of SAP from April 2008 until he resigned in February 2010 following a decision by that company not to renew his contract.During his tenure as chief executive at HP, the company lost more than $30 billion in market capitalization after a series of strategic missteps by the company, leading to his resignation.At SAP, which he joined in 1988 and where he spent more than twenty years, he played an instrumental role in developing and implementing a number of significant changes.