Dave Duffield co founder co CEO Workday

Duffield is the major visionary behind Workday, a cloud based human resources app that has set the enterprise software world on fire and put Oracle on notice. Duffield has been launching successful companies for decades. He previously founded PeopleSoft in 1987 and led it until it was acquired by Oracle in 2005 via a hostile takeover. Then he turned around and thumbed his nose at Larry Ellison, launched Workday and just took it public late last year.