was a Japanese engineer and economist. He was a Professor emeritus of Economics at University of California, Los Angeles. Aoki earned a BA and MSc in Physics from the University of Tokyo, and a PhD in engineering from UCLA in 1960. He was a professor of engineering at UCLA and California–Berkeley from 1960–1974, before switching fields to economics in which he remained a professor until his retirement in 2002. Aoki's change of research areas is reflected in the two editions of his influential textbook, Optimization of Stochastic Systems. Originally published in 1967 it contained a rigorous treatment of optimal control methods in engineering, whereas the second edition (published in 1989) was amended by numerous applications in economics. He died on July 24, 2018, aged 87. Selected publications A revised edition: References External links Website at UCLA 1931 births 2018 deaths People from Hiroshima Prefecture Japanese engineers 20th-century Japanese economists 21st-century Japanese economists University of Tokyo alumni UCLA Henry Samueli School of Engineering and Applied Science alumni University of California, Los Angeles faculty University of Illinois faculty Academic staff of Osaka University Academic staff of Tokyo Institute of Technology Academic staff of Chuo University Academic staff of Gifu Shotoku Gakuen University Fellows of the Econometric Society