Charles “Chuck” F. Serianni, was elected Independent Chairman in June 2021, and prior to his retirement on June 1, 2021, has served as the Special Advisor to the CEO of Republic Services, Inc., a national provider of recycling and non-hazardous solid waste services and environmental solutions. Prior to that role, Mr. Serianni served Republic Services, Inc. as the Executive Vice President, Chief Financial Officer, and Vice President, Controller, West Region. Prior to his work with Republic Services, Mr. Serianni served as Accounting Operations Director for Sunglass Hut International, Inc. and as a Manager, Accounting and Auditing Services for Deloitte & Touche LLP, an international accounting firm. Mr. Serianni holds a bachelor’s degree in Accounting and Finance from the University of Dayton, and he is a member of the American Institute of Certified Public Accountants. Mr. Serianni also brings experience in overseeing the strategic development of complex corporations, as well as experience overseeing effective cyber and technology systems and protocols.

Mr. Bonner has served as an independent director and member of our board of directors since February 2015 and as Independent Chairman from August 2020 until June 2021 and as Executive Chairman from August 2019 until August 2020. Previously, Mr. Bonner served as Vice President and Chief Information Officer of Texas Instruments, a publicly traded company, from January 2000 to May 2014. In this role, Mr. Bonner managed the business processes and technology for the corporation and was a member of the company’s strategy leadership team. During his 33 year tenure Mr. Bonner served Texas Instruments in a number of executive roles with positions in product P+L management, worldwide marketing and acquisition integration. Mr. Bonner served as a member on the board of directors of Copper Mobile from 2012 to 2015 and is currently an advisory board member for Southern Methodist University’s Computer & Electrical Engineering Department. Mr. Bonner also served as an advisory board member for Gemini Israel Funds from June 2004 to May 2015. Mr. Bonner holds an M.B.A. in Marketing and Finance from the Fuqua School of Business at Duke University, an MSEE and BSEE from the University of Michigan, and a B.A. in Physics from Kalamazoo College. He received the Minority & Women Business Development Award from Texas Instruments, the Transformational CIO Award from HMG Strategies and the Most Innovative User of Technology from Information Week Magazine.

Ena Williams is the Chief Operating Officer of Casey’s General Stores, Inc., a Fortune 500 company operating over 2,200 convenience stores in 16 states. Prior to this, she served as the Chief Executive Officer and member of the board of directors of National HME, Inc., a technology enabled hospice medical equipment provider. Prior to that role, she served as senior vice president and head of international operations for 7-Eleven, Inc., where she led the growth strategy and had P&L responsibilities for more than 34,900 licensed, franchised and joint-venture stores in 16 countries, generating approximately $25 billion in system revenue. Also, Ms. Williams held a number of positions in the operations, retail and planning functions of Mobil Oil Corporation and ExxonMobil Corporation. Ms. Williams currently serves on the board of advisors for the Robert B. Rowling Center for Business Law & Leadership, SMU Dedman School of Law. She also serves on the board of directors for Children International. Ms. Williams holds a master’s degree in Business Administration from The Wharton School of the University of Pennsylvania and a bachelor’s degree in Economics and African-American Studies from the University of Virginia. Ms. Williams possesses deep experience managing P&L, executing strategic initiatives and providing data-driven analysis at large corporations across multiple industries with a focus on efficient operations and people leadership.

Catharine Ellingsen is the Executive Vice President, Chief Legal Officer, Chief Ethics & Compliance Officer and Corporate Secretary of Republic Services, Inc., a national provider of recycling and non-hazardous solid waste services and environmental solutions. She oversees Legal Services, Board and Corporate Governance, Ethics and Compliance, Enterprise Risk Management, Labor Relations, Corporate Security, Business Continuity, Real Estate and Facilities Management. Additionally, Catharine is Chair of the Republic Services MOSAIC Council for inclusion and diversity, Executive Sponsor of the Women of Republic Business Resource Group and President of the Republic Services Charitable Foundation. She previously served Republic Services as SVP, Human Resources from 2011-2016 and VP, Deputy General Counsel from 2008-2011. Before joining Republic Services, Ms. Ellingsen served Allied Waste Industries, Inc. in a variety of roles, including VP, Deputy General Counsel and Director, Labor Relations, and practiced law at the law firms of Steptoe & Johnson LLP and Bryan Cave LLP. Ellingsen received her B.A. Cum Laude from Wheaton College and a J.D. Magna Cum Laude from Washington College of Law, The American University. She also completed the Advanced Human Resources Executive Program at the University of Michigan, Ross School of Business.