Takashi Ono

was a Japanese-born American mathematician, specializing in number theory and algebraic groups.

Early life and education Ono was born in Nishinomiya, Japan, on 18 December 1928. He received his Ph.D. in 1958 at Nagoya University.

Career Ono immigrated to the United States after receiving an invitation from J. Robert Oppenheimer to work at the Institute for Advanced Study with a fellowship for the two academic years from 1959 to 1961 and then went to the University of British Columbia to work as an assistant professor of mathematics from 1961 to 1964. From 1964 to 1969 Ono was a tenured professor at the University of Pennsylvania. From 1969 to his retirement in 2011, he was a professor at Johns Hopkins University. In 1966 he was an invited speaker at the International Congress of Mathematicians in Moscow.

Personal life and death Ono's youngest son, Ken Ono, is also a mathematician and professor at the University of Virginia as well as a former triathlete. His middle son, Santa J. Ono, served as the 15th President of the University of Michigan (previously the President and Vice-Chancellor of the University of British Columbia) and is a biomedical researcher. His eldest son, Momoro Ono, is a music professor at Creighton University. Ono died on 11 January 2026, at the age of 97.

Selected publications 1959: 1961: 1963: 1964: 1965: 1965: 1969: 1969: 1990: , 1994: 2008: