S un Weijie is the co-founder and chairman of the Yantai Jereh Oilfield Services Group, a prominent Chinese manufacturer of oil and gas equipment. He established the company in 1999 in Yantai, Shandong province, initially importing spare parts for mining equipment before transitioning into the manufacturing of specialized oilfield machinery. Jereh Group has since evolved into a global player, providing drilling rigs, fracturing equipment, and engineering services to the energy sector.

Under Sun's strategic direction, Jereh successfully listed on the Shenzhen Stock Exchange in 2014. The company has expanded its footprint internationally, operating in over 70 countries and competing with established Western firms. Sun's leadership has been characterized by a focus on technological innovation and navigating the cyclical nature of the global energy market, positioning Jereh as a leader in the oilfield services industry.