Professional Experience: Research Assistant, The University of Tokyo, 1968-1971; Associate Professor, Nagoya University, 1971-1983; Associate Professor 1983-1985, Professor 1985-1993, Hitotsubashi University; Professor, The University of Tokyo, 1993-2007; Professor, Waseda University, 2007—; Professor Emeritus, The University of Tokyo, 2007—. Research Abroad: Visiting Fellow, Harvard Law School, 1978-1979; Visiting Fellow, University of Michigan Law School, 1979-1980; Visiting Fellow, Seoul National University, 2006.