Elected Academician of the International Eurasian Academy of Sciences in 1996, Professor Jiadong Sun was a distinguished Chinese aerospace engineer whose career encompassed missile systems, satellite engineering, space exploration, and satellite navigation. Born on 8 April 1929 in Fuxian County, Liaoning Province, now Wafangdian, he enrolled in preparatory Russian-language studies at Harbin Institute of Technology in 1948 and, in 1951, was selected to study aircraft engine engineering at the Zhukovsky Air Force Engineering Academy in the Soviet Union. He graduated in 1958 and returned to China that year, joining the First Sub-Academy of the Fifth Research Academy of the Ministry of National Defense. He was elected an Academician of the International Academy of Astronautics in 1988, a Member of the Chinese Academy of Sciences in 1991, and an Academician of the International Eurasian Academy of Sciences in 1996. His early career focused on missile systems, including service as Chief Designer of China’s first independently developed liquid-fuelled medium-range ballistic missile systems. In 1967, he transferred to the newly established China Academy of Space Technology, where he subsequently held senior technical and administrative positions, including Vice President and President, and also served as Chief Engineer of the Seventh Ministry of Machine Building, Vice Minister of the Ministry of Aerospace Industry, and Vice Minister and Director of its Science and Technology Committee.