Vice President Operations
Marc Hornbrook joined TransAtlantic Petroleum in 2019 as the Vice President of Operations in Turkey.
Prior to joining TransAtlantic, Mr. Hornbrook spent nearly 30 years with BP as Petroleum Engineer, Commercial Manager, Head of Engineering, VP Safety & Operational Discipline, VP Operations and General Manager working in Alaska, Colombia, Houston, Amarillo, London, Dubai and Iraq. After retiring from BP the end of 2016 Mr. Hornbrook worked for Williams Companies in Tulsa, OK for 2 years.
Mr. Hornbrook holds a B.S. degree in Petroleum Engineering from the University of Tulsa, M.S. degree in Petroleum Engineering from the University of Alaska – Fairbanks and an M.S. degree in Arctic Engineering from the University of Alaska – Anchorage.
Senior Reservoir Engineer
Koray Yilmaz was appointed Senior Reservoir Engineer for TransAtlantic Petroleum in 2016. His primary responsibilities include the all aspects of reservoir engineering studies and supporting asset teams to facilitate the execution of operations and asset development. He has held various positions in Completions and Reservoir Engineering for TransAtlantic Petroleum since 2012.
Prior to joining TransAtlantic, Mr. Yilmaz served as Coiled Tubing Engineer for Viking Services where he was heavily involved in horizontal well interventions in the Permian Basin. Before joining Viking, Mr. Yilmaz served in various production and reservoir engineering roles for independent oil/gas producers in Turkey. He also serves as a technical reviewer for Journal of Natural Gas Science and Engineering.
Mr. Yilmaz holds B.S. and M.S. degrees in Petroleum Engineering from Istanbul Technical University and an M.B.A. degree from The University of Texas Austin McCombs School of Business.
James Follis has served as Drilling Manager for TransAtlantic Petroleum since 2014. Mr. Follis is responsible for and oversees all drilling operations.
Mr. Follis has been in the oil and natural gas industry since 1989 and has served as Vice President of Operations for Longfellow Energy since 2007. Prior to joining Longfellow Energy, Mr. Follis served in several managerial operational roles for over 18 years with Riata Energy, Inc. and Lariat Services. He managed Riata’s operations in Texas, Oklahoma, Colorado, Utah, Wyoming and Kentucky and assumed the role of Vice President of Operations in 2000. In his career, he has drilled more than 475 wells.
Staff Operations Engineer
Javier Gonzalez was appointed Operation Staff Engineer in June 2019. Mr. Gonzalez's primary responsibilities are to support the efficient and safe drilling operations of TransAtlantic Petroleum's assets. He has previously held the Operation Manager role in Turkey responsible for the safe and efficient operation and development of TransAtlantic Petroleum's assets in Turkey, Bulgaria, and the region as well as manage the local technical teams
Prior to joining TransAtlantic, Mr. Gonzalez served in several managerial and technical roles in Drilling, Completion, and Production Operations at Occidental Petroleum, Shell E&P, and Schlumberger. He has worked in the Permian Basin, South Texas, Venezuela, Mexico, Russia, and the Gulf of Mexico.
Mr. Gonzalez holds a B.Sc. in Petroleum Engineering from The University of Tulsa and a M.B.A. degree from the University of Houston. He is also an active member of the SPE.
Burc Umul has served as Senior Geoscientist for TransAtlantic Petroleum since 2012. Mr. Umul's responsibilities include exploration and development projects in Southeast Turkey, with special focus in Mardin Cretaceous prospects and Selmo Field projects.
Prior to joining TransAtlantic Petroleum, Mr. Umul took over as Head of Geology Department at Thrace Basin Natural Gas Company (TBNG) from 2008 to 2012 and served as the Exploration Team Leader upon TransAtlantic Petroleum's acquisition of Thrace Basin Natural Gas Company (TBNG). From 2002 to 2008, Mr. Umul was Site Geologist at TBNC. Mr. Umul began his career as a Geological Engineer at a local surface investigation company in Turkey in 1997.
Mr. Umul holds a B.S. degree in Geological Engineering from Hacettepe University and is a member of AAPG and the Turkish Association of Petroleum Geologists.
Sherrie Peña Cawthon
Sherrie Peña Cawthon joined TransAtlantic Petroleum in 2014 as a Senior Geoscientist. Mrs. Cawthon’s responsibilities include exploration and development projects focused on the Molla region of Southeast Turkey.
Prior to joining TransAtlantic Petroleum, Mrs. Cawthon worked for Pioneer Natural Resources for 10 years. During that time, she worked various assets and her experience includes both Exploration and Development Geology with focus on a wide range of plays such as the Gulf of Mexico Shelf, Deepwater West Africa, Marble Falls Clastics and Barnett Shale in the Fort Worth Basin, as well as the Edwards and Eagle Ford trends in South Texas.
Mrs. Cawthon holds a M.Sc. of Geosciences degree and a Certification in Remote Sensing from The University of Texas at Dallas and a B.A. degree in Geology from Southern Methodist University. She is also a member of the AAPG.
Noah M. Mitchell 4th
Noah M. Mitchell 4th has served as Vice President of TransAtlantic Petroleum since 2014.
Prior to joining TransAtlantic Petroleum, Mr. Mitchell worked in various leadership capacities in international oilfield service companies. Mr. Mitchell continues to serve as an Executive Manager of Production Solutions International, an Eastern European focused oilfield service company.
In addition to his international experience, Mr. Mitchell founded and served as President of Viking Coil Tubing, an Permian Basin focused oilfield service company until its sale to Conquest Completion Services, a Warburg Pincus portfolio company, in 2018. Mr. Mitchell founded and serves as the Manager of the General Partner of Red Rock Minerals, LP, an Anadarko Basin focused mineral rights company.
Mr. Mitchell holds a B.S. degree from Southern Methodist University.
Veli Ozan Ülker
Eastern Europe Chief Financial Officer
Ozan Ulker was appointed as Eastern Europe CFO for TransAtlantic Petroleum Turkey in 2016. His management responsibilities include area credit facilities, cash management, statutory accounting, tax, and auditing. Mr. Ulker initially joined TransAtlantic Petroleum in 2010 serving in different areas including management of marketing and trading unit.
Prior to joining TransAtlantic Petroleum, Mr. Ulker worked in different industries including Banking, FMCG, Retail and Energy Trading in multinational companies, Nestle and Fiba Group from 2008 to 2010, Citibank from 2004 to 2007.
Mr. Ulker has a Bachelor’s degree in Political Sciences from Istanbul University and holds Advanced Level Certificate from Capital Market Board of Turkey.