Dr. Mao Yisheng aka. Thomson Eason Mao (Chinese: 茅以升; pinyin: Máo Yǐshēng; Wade–Giles: Mao2 I3-sheng1; January 9, 1896 – November 12, 1989) was a Chinese structural engineer and social activist. He was one of the most famous Chinese structural engineers, a pioneer in bridge construction, and a social activist.