Stephen L. Cropper

Mr. Cropper brings substantial energy experience to the Partnership, and has worked in various executive management and governance roles in the energy industry throughout his career. He currently serves as a director of three other energy companies and Quiktrip. He has previously served on the Board of Directors for Sunoco Logistics Partners LP, Berry Petroleum Company and NRG Energy, Inc. In 1998, he retired after 25 years with The Williams Companies, where he most recently served as the President and Chief Executive Officer of Williams Energy Services, a Williams’ operating unit involved in various energy-related businesses. Mr. Cropper was also a director and member of the audit committee for Energy Transfer Partners LP from 2000 until 2005. In addition, he is a past President of the Association of Oil Pipelines.