SemGroup Corporation and Rose Rock Midstream(R), L.P. announced that Carlin G. Conner has been named president and chief executive officer of SemGroup, effective April 1, 2014. Conner will be appointed to the SemGroup board of directors and will also become president and chief executive officer of Rose Rock Midstream and chairman of the board of directors of Rose Rock Midstream's general partner. Szydlowski will remain with the company through Conner's start date to facilitate a seamless transition of leadership responsibilities.

Conner, who has more than 23 years of experience in the midstream industry, joined Oiltanking Houston, L.P. in 2000 and served in positions of increasing responsibility, including six years as president and chief executive officer of Oiltanking Holding Americas Inc. He also lead the IPO of Oiltanking Partners, L.P.