Employees at Aramark rank John Zillmer in the Bottom 10% of CEOs in Philadelphia, PA. Comparatively, employees at Serco rank David Dacquino in the Bottom 40% of CEOs in Washington, DC. Employees rate their CEO differently based on the frequency of interaction, ability to affect company culture, and drive measurable results.
At Aramark, employees in the Engineering department rate John Zillmer the highest. According to employees, John Zillmer's ability to drive business results is Excellent. At Serco, the IT department's employees rate their CEO highest.