SemGroup® Corporation announced that Chairman John F. Chlebowski has informed the company of his decision to retire from the Board of Directors effective Dec. 31, 2016. Mr. Chlebowski has served as a founding Director and Chairman of the Board of Directors of SemGroup since 2009. Thomas R. McDaniel, who has also served as a founding Director of SemGroup since 2009, has been elected the new Chairman effective Jan. 1, 2017. Incoming Chairman Mr. McDaniel currently serves as Chairman of the Compensation Committee and on the Nominating and Corporate Governance Committee of the Board of Directors. He has extensive operational and financial management experience. Mr. McDaniel was executive vice president, chief financial officer and treasurer of Edison International before retiring in 2008 after 37 years of service.