1986-1989, Assistant Professor, Department of Economics, University of Chicago, USA.

1989-1999, Associate Professor, Department of Social and International Relations, University of Tokyo, Japan.

1993-1994, Visiting Professor, Department of Economics, University of Western Australia.

1999-2000, Professor, Department of Advanced Social and International Studies, University of Tokyo, Japan.

2000-, Professor, Department of Technology Management for Innovations, Graduate School of Engineering, University of Tokyo, Japan.

Fellow, Modelling and Simulation Society of Australia and New Zealand, elected 2014.

Member of Editorial Board, Annals of Financial Economics, from 2013.

Member of Editorial Board, Journal of Risk and Financial Management, from 2013.

Member of Editorial Board, Journal of Informatics and Data Mining, from 2015.

Member of Editorial Board, Journal of Heath & Medical Economics, from 2015.

Keynote Speaker, International Congress on Modelling and Simulation, Gold Coast, Australia, 2015.