Columbia Banking System, Inc. announced that Craig D. Eerkes, who has served on the Board of Directors of the Company and its wholly owned subsidiary Columbia Bank since September 2014, has been appointed as Chairman of the Board. During his time on the Board of Columbia, Mr. Eerkes has served on the Personnel and Compensation, Enterprise Risk Management, and Trust Committees. Mr. Eerkes succeeds William T. Weyerhaeuser, who served as the Chairman of the Board since 2001 and Director since 1998. Mr. Weyerhaeuser will remain on the Board as a Director. In accordance with its governance policy that requires mandatory retirement at age 75, the Company also announced that Mr. Weyerhaeuser, along with Directors John P. Folsom and David A. Dietzler, will retire from the Board of Directors at the 2019 Annual Meeting of Shareholders. Mr. Eerkes has served as the President and Chief Executive Officer of Sun Pacific Energy, Inc. since 1981.