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István Joó (September 18, 1948 - December 8, 1998) was a distinguished Hungarian mathematician, known for his significant contributions to various fields including analysis, orthogonal series, martingale theory, game theory, operations research, and number theory. He authored over 200 publications, collaborating on 12 joint articles with Paul Erdős. Joó's impactful work includes the resolution of a problem posed by J.-L. Lions, K.D. Graham, D.L. Russell, and V. Komornik in control theory, advancements in the spectral theory of differential operators, an elementary proof for John von Neumann's minimax theorem, and breakthroughs in the exact controllability of circular membranes.

Joó pursued his academic journey at Eötvös Loránd University, where he earned his Ph.D. in mathematics in 1974. A member of the Bolyai János Society since 1972, he was honored with the Rényi-Kató Prize in 1973. Subsequently, he held a scholarship at the Analysis II department of Eötvös Loránd University from 1973 to 1977. In 1975, Joó was awarded the Grünwald Géza Prize. His academic career progressed as he served as an assistant research fellow (1977-1980), senior research fellow (1982-1994), and eventually as a scientific advisor (1994-1998) after obtaining a Doctor of the Hungarian Academy of Sciences (DSc) in 1994. Joó also contributed to international academia as a guest professor at the Ohio State University from 1987 to 1988 and became a member of the American Mathematical Society in 1988.