17. Marius Haas, HP
Marius Haas presided over some of the biggest gains for HP's networking division in its history, but ultimately sought a return to an M&A and investment role much like the one he enjoyed at the computing titan before his networking promotion. Haas left HP in May to become an industry advisor to private equity firm Kohlberg Kravis Roberts & Co., where he is working with the KKR team to identify new investments in the technology sector. At HP Networking, Haas was replaced by Bethany Mayer, who headed the unit on an interim basis and then was formally appointed in October 2011.