Leadership Team

Gregory J. Yess, CPA

Managing Director, Client Services and Chief Operating Officer

Committees: Chairman, Management Committee

Greg is a managing director, chief operating officer and chair of NISA’s Management Committee. Greg is responsible for the day-to-day oversight of many of NISA’s operating departments including Client Services, Operations, Technology, Risk Management, and Administration. He also works with various departments to develop new products and growth initiatives.

Prior to joining NISA in 2000, Greg spent three years as the COO and CFO of Tulsa-based Saint Francis Health System. From 1991 to 1997, he co-founded and directed Weiss, Yess and Co. (currently CBIZ), a business and financial advisory firm. From 1982 to 1991, Greg worked for Arthur Andersen LLP as a senior manager providing business consulting and tax services. Greg holds a BS in Accounting from Illinois Wesleyan University.