On March 20, 2017, the board of directors of SemGroup Corporation, upon the recommendation of the nominating and corporate governance committee of the board, elected William J. McAdam to serve as a director of the Board, to fill a vacant position created by the retirement of John F. Chlebowski on December 31, 2016, for a term expiring at the next annual meeting of stockholders and until his successor is duly elected or chosen and qualifies, unless he sooner dies, resigns or is removed. Upon further recommendation of the nominating and corporate governance committee, Mr. McAdam has been appointed to the nominating and corporate governance committee of the board. Mr. McAdam served as president and chief executive officer of Aux Sable Canada LP and Aux Sable Liquid Products LP for 14 years until his retirement in 2013. Mr. McAdam has more than four decades of experience in the energy industry, including positions with Imperial Oil and Exxon Chemical in Sarnia, Toronto, New York, Edmonton and Calgary.