SemGroup Corp. Chairman John Chlebowski will retire from the company's board, effective Dec. 31, according to a Dec. 14 news release. Thomas McDaniel has been elected to replace him, effective Jan. 1, 2017.

Both Chlebowski and McDaniel were founding directors and have served on the SemGroup board since 2009.

McDaniel is chairman of the compensation committee and serves on the nominating and corporate governance committee of the board.