David G DeWalt

Dave DeWalt from Scottsdale, Arizona -- known for his big personality, top-secret government clearance, DeWalt worked as former chief executive at McAfee, helped steer Intel's acquisition of the company. DeWalt then became Chairman and CEO of FireEye, hired to take it public in September 2013. A few months later in December 2013, FireEye acquired Mandiant. DeWalt has since advised the White House on the National Security Technology Advisory Council.