Qian Xuesen (Chinese: 钱学森; December 11, 1911 – October 31, 2009; also spelled as Tsien Hsue-shen) was a Chinese aerospace engineer and cyberneticist who made significant contributions to the field of aerodynamics and established engineering cybernetics. He achieved recognition as one of America's leading experts in rockets and high-speed flight theory prior to being deported to China in 1955. This occurred after having been accused of Communist sympathies — without evidence — during the Red Scare. Qian received his undergraduate education in mechanical engineering at National Chiao Tung University in Shanghai in 1934. He traveled to the United States in 1935 and attained a master's degree in aeronautical engineering at the Massachusetts Institute of Technology in 1936. Afterward, he joined Theodore von Kármán's group at the California Institute of Technology in 1936, received a doctorate in aeronautics and mathematics there in 1939, and became an associate professor at Caltech in 1943. While at Caltech, he co-founded NASA's Jet Propulsion Laboratory. He was recruited by the United States Department of Defense and the Department of War to serve in various positions, including as an expert consultant with a rank of colonel in 1945. He became an associate professor at MIT in 1946, a full professor at MIT in 1947, and a full professor at Caltech in 1949. During the Second Red Scare in the 1950s, the United States federal government accused him of communist sympathies. In 1950, despite protests by his colleagues and without any evidence of the allegations, he was stripped of his security clearance. He was given a deferred deportation order by the Immigration and Naturalization Service, and for the following five years, he and his family were subjected to partial house arrest and government surveillance in an effort to gradually make his technical knowledge obsolete. After spending five years under house arrest, he was released in 1955 in exchange for the repatriation of American pilots who had been captured during the Korean War. He left the United States in September 1955 on the American President Lines passenger liner SS President Cleveland, arriving in mainland China via Hong Kong. Upon his return, he helped lead development of the Dongfeng ballistic missile and the Chinese space program. He also played a significant part in the construction and development of China's defense industry, higher education and research system, rocket force, and a key technology university. For his contributions, he became known as the "Father of Chinese Rocketry" and was nicknamed the "King of Rocketry". He is recognized as one of the founding fathers of Two Bombs, One Satellite. In 1957, Qian was elected an academician of the Chinese Academy of Sciences. He served as a Vice Chairman of the National Committee of the Chinese People's Political Consultative Conference from 1987 to 1998. He was the cousin of engineer Hsue-Chu Tsien, who was involved in the aerospace industries of both China and the United States. He is a cousin of the father of Roger Y. Tsien, the 2008 winner of the Nobel Prize in Chemistry.
Early life and education Qian was born in the Shanghai International Settlement, with ancestral roots in Lin'an, Hangzhou, in 1911. His parents were Qian Junfu and Zhang Lanjuan. He graduated from the High School Affiliated to Beijing Normal University, and attended Shanghai Jiaotong University. There, he received a bachelor's degree in mechanical engineering with an emphasis on railroad administration in 1934. He interned at Nanchang Air Force Base. After graduating from college, Qian was admitted to the Boxer Indemnity Scholarship program, enabling him to study in the United States. He left China in August 1935, and went to the Massachusetts Institute of Technology (MIT) for a master's program in mechanical engineering. He received a Master of Science in aeronautical engineering from MIT on December 18, 1936. His master's thesis was titled Study of the turbulent boundary layer. While at MIT, Qian was influenced by the methods of American engineering education, especially its focus on experimentation. This was in contrast to the contemporary approach practiced by many Chinese scientists, which emphasized theoretical elements rather than direct experience. Qian's experiments included plotting of pitot pressures using mercury-filled manometers. Theodore von Kármán, Qian's doctoral advisor, described their first meeting:
One day in 1936, he came to me for advice on further graduate studies. This was our first meeting. I looked up to observe a slight, short young man, with a serious look, who answered my questions with unusual precision. I was immediately impressed with the keenness and quickness of his mind, and I suggested that he enroll at Caltech for advanced study ... Tsien agreed. He worked with me on many mathematical problems. I found him to be quite imaginative, with a mathematical aptitude that he combined successfully with a great ability to visualize accurately the physical picture of natural phenomena. Even as a young student, he helped clear up some of my own ideas on several difficult topics. These are gifts which I had not often encountered and Tsien and I became close colleagues. Kármán made his home a social scene for the aerodynamicists of Pasadena, and Qian was drawn in: "Tsien enjoyed visiting my home, and my sister took to him because of his interesting ideas and straightforward manner." Shortly after arriving at the California Institute of Technology in 1936, Qian became fascinated with the rocketry ideas of Frank Malina, other students of von Kármán, and their associates, including Jack Parsons. Along with his fellow students, he was involved in rocket-related experiments at the Guggenheim Aeronautical Laboratory at Caltech. Around the university, the dangerous and explosive nature of their work earned them the nickname "Suicide Squad". Qian received a Doctor of Philosophy magna cum laude in aeronautics and mathematics from Caltech on June 9, 1939. His doctoral dissertation was titled Problems in motion of compressible fluids and reaction propulsion. Qian and von Kármán developed the Kármán-Tsien (Kármán-Qian) rule for estimating compressibility effects of subsonic flow in the field of fluid mechanics.
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