


Employees at Aramark rank John Zillmer in the Bottom 15% of CEOs in Philadelphia, PA. Comparatively, employees at ISS Group rank Daniel Ryan in the Top 15% of CEOs in San Antonio, TX. Employees rate their CEO differently based on the frequency of interaction, ability to affect company culture, and drive measurable results.

Women at Aramark rated their CEO a D

Women at ISS Group rated their CEO an A+

Diverse Employees at Aramark rated their CEO a C-

Diverse Employees at ISS Group rated their CEO a B-




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 ISS Group, the Engineering department's employees rate their CEO highest. And, 60% of ISS Group's employees approve of their CEO's management style.