|Revised Romanization||I Seunggi|
Ri Sung-gi, also often spelled Lee Sung-ki or Yi Sung-gi (1905–1996) was a North Korean chemist. He is best remembered as the inventor of Vinalon. He has also been accused of involvement in North Korea's chemical and nuclear weapons programs.
Ri was born in Damyang, Jeollanam-do, in 1905. He graduated from the local pot'ong hakkyo and received his degree in chemistry from Kyoto University in 1931. He developed Vinalon in 1939. In 1946, after Korean independence from Japanese occupation, he participated in the development of Kyŏngsŏng University, but strongly opposed the university's official conversion to Seoul National University under the American military government. Following the outbreak of the Korean War in 1950, he defected to the North.
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