D ong Jinggui is a Chinese billionaire and the chairman of Yantai Jereh Oilfield Services Group, a leading private provider of equipment and services for the oil and gas industry in China. He has built his company into a major player by serving the needs of China's massive state-owned energy companies as they work to extract the country's oil and gas resources.

Jereh Group manufactures a wide range of oilfield equipment, including fracking trucks and drilling components, and also provides engineering and technical services. Under Dong's leadership, the company has not only become a key domestic supplier but has also expanded its business internationally, exporting its equipment to energy-producing regions around the world. The company is publicly traded on the Shenzhen Stock Exchange, and Dong's controlling stake is the basis of his fortune.