Li Siguang, also known as J. S. Lee, was a Chinese geologist and politician. He was the founder of China's geomechanics. He was an ethnic Mongol. He made outstanding contributions, which changed the situation of "oil deficiency" in the country, enabling the large-scale development of oil fields to raise the country to the ranks of the world's major oil producers.

Mongols in China, also known as Mongolian Chinese, are ethnic Mongols who live in China. They are one of the 56 ethnic groups recognized by the Chinese government.