Carlin G. Conner was appointed president and CEO of SemGroup Corp. (NYSE: SEMG), and was also appointed to SemGroup’s board of directors, while additionally being appointed as the president and CEO of Rose Rock Midstream LP (NYSE: RRMS), SemGroup Corp. said March 6. Conner’s roles at SemGroup take effect April 1, the company noted.

He was also appointed to the board of directors at Rose Rock’s general partner, SemGroup added.

Conner replaces Norm Szydlowski in the executive and board member roles at both companies, SemGroup said.

Conner has more than 23 years’ midstream industry experience, the company said, noting that he joined Oiltanking Houston LP in 2000 and for six years was president and CEO of Oiltanking Holding Americas Inc. He led the initial public offering (IPO) of Oiltanking Partners LP (NYSE: OILT), the company said.

In 2011, Conner became board chairman for Oiltanking Partners and its general partner and in 2012 became Oiltanking Group’s managing director, the company added.

"We are excited to name Carlin as chief executive officer. His significant industry experience, in and out of U.S. markets, as well as proven leadership capabilities and successful track record will serve SemGroup and Rose Rock well as we enter into our next phase of growth and success, said John F. Chlebowski Jr., chairman of the board of SemGroup.

He continued, “The board is confident that we have the right team to continue executing our strategic plan for the benefit of our customers, partners and shareholders.”

Conner said, "I'm honored to have the opportunity to lead SemGroup, a company I have known and admired. I look forward to working with the SemGroup team as we grow our interests and strengthen our position in the midstream industry."

He added, “We have a board and management team that is ready to take the next steps on our growth path while we continue to deliver results through developing diversified energy services for our customers. I would also like to thank Norm for his outstanding service over the last few years. I very much look forward to working with him through the transition."

Tulsa, Okla.-based SemGroup Corp. provides midstream services to the oil and natural gas industry.

Rose Rock Midstream LP, also Tulsa, Okla.-based, is a Delaware limited partnership (LP) owning, operating, developing and acquiring midstream energy assets.