Jun O'Hara, legally named Jun Imai (今井 淳, Imai Jun), is a Japanese mathematician who works on the fields of low-dimensional topology and knot theory.
He is a professor at Chiba University.
He is famous for his discovery of Möbius energy, a type of knot energy.
[1][2] He was born on 29 March 1963 in Hiroshima, Japan.
He was a PhD student of Takashi Tsuboi at the University of Tokyo.