- 2021/04 - 現在 Università degli Studi di Milano-Bicocca, Dipartimento di Scienza dei Materiali, Joint Project Professor
- 2021/04 - 2024/03 The University of Electro-Communications, Specially-appointed Professor
- 2017/04 - 2021/03 National Institute of Technology, Anan College, Visiting Professor
- 2017/09 - 2020/08 Università degli Studi di Milano-Bicocca, Dipartimento di Scienza dei Materiali, Visiting Professor, Assegnista di ricerca (Research Fellow)
- 2007/04 - 2017/03 National Institute of Technology, Anan College, Special Research Professor (Nichia Corporation Endowed Chair)
- 2013/05 - 2013/09 Osaka University, The Institute of Scientific and Industrial Research, Visiting Professor
- 2011/04 - 2012/03 The University of Tokyo, The Institute for Solid State Physics, Visiting Professor
- 2003/01 - 2007/03 The University of Tokyo, Institute of Industrial Science, Specially Appointed Associate Professor
- 2001/04 - 2002/12 National Institute for Materials Science, Nanodevice (Research) Group, Senior Researcher
- 1993/04 - 2001/03 Science and Technology Agency, National Research Institute for Metals, Researcher → Senior Researcher
- 1988/08 - 1989/12 The University of Michigan, Department of Electrical Engineering, Research Assistant (supported by NASA-Langley, NASA-CR-185439,185440)
- 1986/04 - 1987/03 Science and Technology Agency, National Research Institute for Metals, Intern