Executive Leadership Team

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Executive Leadership Team

Carlin G. Conner
Chief Executive Officer

Carlin G. Conner has served as a director and as President and Chief Executive Officer of SemGroup since April 2014. Mr. Conner also serves as chairman of the board of directors, president and chief executive officer of our wholly owned subsidiary Rose Rock Midstream GP, LLC, the general partner of Rose Rock Midstream, L.P. From June 2012 until March 2014, Mr. Conner served as managing director of Oiltanking GmbH, an independent worldwide storage provider of crude oil, refined petroleum products, liquid chemicals and gases. He served as a member of the board of directors of the general partner of Oiltanking Partners, L.P., a publicly traded master limited partnership engaged in independent terminaling, storage and transportation of crude oil, refined petroleum products and liquefied petroleum gas (“Oiltanking Partners”), from March 2011 until March 2014, and was elected chairman in July 2011 in connection with the completion of Oiltanking Partners’ initial public offering. Mr. Conner also served as president and chief executive officer of Oiltanking Partner’s general partner from March 2011 to November 2012 and as president and chief executive officer of Oiltanking Holding Americas, Inc., a wholly owned subsidiary of Oiltanking GmbH from July 2006 to November 2012. Previously, from 2003 to 2006, he worked at Oiltanking GmbH’s corporate headquarters in Hamburg, Germany, where he was responsible for international business development and sat on the boards of several Oiltanking GmbH ventures. He joined Oiltanking Houston, L.P. in 2000. He began his career at GATX Terminals Corporation and served in various roles, including operations and commercial management.

He graduated from McNeese State Univesity with a Bachelor of Science degree in environmental science.

Robert N. Fitzgerald
Senior Vice President and Chief Financial Officer

Robert N. Fitzgerald joined SemGroup® Corporation in November 2009 and serves as senior vice president and chief financial officer. Prior to joining SemGroup, Fitzgerald served as chief financial officer from February 2008 to November 2009 of Windsor Energy Group, a private independent oil and gas exploration and development company. He has also served in senior financial and operating roles in commodity transportation and telecommunication companies. Fitzgerald was with BP Amoco and Amoco Corporation for 20 years, working in various financial and operations positions in Tulsa, Oklahoma; Houston, Texas; Denver, Colorado; and Chicago, Illinois.

Fitzgerald received a master’s degree in business administration from the University of Tulsa and a bachelor of business administration degree from Western Illinois University. He is currently a member of the American Institute of Certified Public Accountants, the Institute of Management Accountants and the Institute of Internal Auditors. He is a certified public accountant.

Timothy R. O'Sullivan
Vice President - Corporate Planning and Strategic Initiatives

Timothy R. O’Sullivan serves as Vice President, Corporate Planning and Strategic Initiatives of SemGroup, a position he has held since April 2010. Mr. O’Sullivan also serves as a director and Vice President of Rose Rock Midstream GP, LLC, the general partner of Rose Rock Midstream, L.P. From February 2005 until April 2010, he served as President and Chief Operating Officer of SemGas, L.P. From 2001 until joining our company, Mr. O’Sullivan worked for Williams Power Company where he was director of global gas and power origination. He was previously employed with Koch Industries, Inc. for 19 years where he served in various capacities in its natural gas division, including business development, marketing and trading, and executive management. Mr. O’Sullivan began his career as a staff accountant for Main Hurdman. Mr. O’Sullivan graduated from Wichita State University with a bachelor’s degree in accounting. Mr. O’Sullivan was a member of the board of directors of the Gas Processors Association and served on its Executive and Finance Committee.

Candice L. Cheeseman
General Counsel and Secretary
Candice L. Cheeseman joined SemGroup® Corporation in February 2010 and serves as general counsel and secretary. Prior to joining our company, Cheeseman served as general counsel of Global Power Equipment Group Inc., a comprehensive provider of power generation equipment and maintenance services for energy customers, since May 2004. In September 2006, Global Power Equipment Group Inc. and its domestic subsidiaries filed voluntary petitions for relief under Chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the District of Delaware. Global Power Equipment Group and its subsidiaries emerged from bankruptcy protection in January 2008. Prior to Global Power, she was employed by WilTel Communications Group, an internet, data, voice and video service provider, where she served in a variety of capacities, including general counsel and secretary, commencing in November 2002. Cheeseman has been a practicing attorney for two decades serving in various capacities for Williams Communications, Marriott International and law firms in the Washington D.C. area.

Cheeseman received her juris doctorate degree from the University of Tulsa College of Law. She also holds a bachelor of arts degree from the University of Delaware.
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