Li Siguang, also known as J. S. Lee, was a Chinese geologist and politician. He was the founder of China's geomechanics. 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.
Li studied in Osaka Technical College in Japan and the University of Birmingham in UK in his early years. He became a geological professor at Peking University upon his return from abroad in 1920. Li Siguang was Wuhan University building preparatory chairman from July 1928 to April 1938. He was the president of the National Central University (Nanjing University) in 1932.
After the People's Republic of China was established, Li held the positions of vice president of the Chinese Academy of Sciences (CAS) and minister of geology.