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Mr Zhang is President and Chief Operating Officer of Greka Drilling China in 2017. He joined Greka Drilling as General Manager, and Chief Operating Officer of Greka Technical Services in January 2008. Mr Zhang has over 40 years of experience in oil and gas engineering technical services. He joined the oil and gas industry in 1967 and has held a range of positions in several petroleum companies, including technician of an oil production team in Daqing Petroleum Administration Bureau, production coordinator of a plant in Jianghan Petroleum Administration Bureau and engineer of a drilling managing plant in Jinlin Petroleum Administration Bureau. From 1976 to 1995, he worked at Huabei Petroleum Administration Bureau, a drilling and engineering services subsidiary of CNPC, as an engineer and in various senior management positions. From 1995 to 1999, Mr Zhang was the General Manager of China National Oil Developing Company and was appointed as President of Huabei Petroleum Administration Bureau from 1999 to 2004. From January 2003 to January 2008, he was a member of the Standing Committee of Hebei Provincial People's Congress. Mr Zhang worked as an external consultant to Greka BV from July 2007 to January 2008. Mr Zhang graduated from Beijing Geology College, majoring in Petroleum in 1966.