Born August 29, 1918 in Nymegen, Netherlands.
Louis Block Professor of Physics and Chemistry, Emeritus, University of Chicago, Illinois, USA.
Clemens Roothaan was educated at the Technical Institute Delft (MS 1945) and at the University of Chicago (PhD, Physics 1950). He was Research Associate (1949–50), Louis Block Professor of Chemistry and Physics (1950–88), Professor of Communications and Information Science (1965–68), Director of the Computation Center (1962–68), at the University of Chicago.
He was also Guggenheim Fellow, Cambridge University (1957), Consultant for : Argonne National Laboratory (1958-66), Lockheed Missiles and Space Company (1960-65), Union Carbide Corporation (1965-), IBM Corporation (1965-). He has been Visiting Professor at the Ohio State University (1976), the Technical University, Lyngby, Denmark (1983).
He is a member of the American Physical Society and a Corresponding Member of the Royal Dutch Academy of Science.