Mr. Henderson retired as Vice Chairman, Client Service at PricewaterhouseCoopers LLP in June 2016, a position he held since 2007, and served as the firm's Managing Partner of the Greater Chicago Market from 2003 through 2013. He has been a Certified Public Accountant since 1977 and gained significant experience working with the boards and audit committees of Fortune 500 companies. He is the lead director and chair of the corporate governance committee of Northern Trust Corporation, where he has served since July 2016, and a director and chair of the audit committee of Illinois Tool Works Inc., where he has served since August 2016.