SemGroup Corporation announced that Ms. Candice L. Cheeseman, age 61, advised the company that she intended to retire as Vice President and General Counsel of the company. Ms. Cheeseman retired as an officer of the Company effective June 19, 2017. The Board of Directors of the company appointed Susan Lindberg, age 52, as Vice President and General Counsel of the company effective June 19, 2017.