Takeshi Oka (岡 武史, Oka Takeshi; born 1932), , is a Japanese-American spectroscopist and astronomer specializing in the field of galactic astronomy, known as a pioneer of astrochemistry and the co-discoverer of interstellar trihydrogen cation (H+3). He is now R.A. Milliken Distinguished Service Emeritus Professor, Departments of Astronomy and Astrophysics, Chemistry; Enrico Fermi Institute; and the College of University of Chicago.
Source: “Takeshi Oka”, English Wikipedia (CC BY-SA 4.0), excerpt