2020–present: Deputy Hospital Director, National Institute for Quantum Science and Technology, QST Hospital 2017–2019: Professor, University of Tsukuba, Medical Sciences 2011–2016: Associate Professor, Graduate School of Medicine and Medical Sciences, University of Tsukuba 2011: Associate Professor, University of Tsukuba, Graduate School of Comprehensive Human Sciences 2006–2010: Lecturer, Gunma University, School of Medicine 2006: Assistant Professor, Gunma University, School of Medicine 2005: Research Scientist, National Institute of Radiological Sciences, Heavy Ion Medical 2004: Research Scientist, Research Institute of Radiation Biology and Medicine, Gunma University 2002–2003: Assistant Professor, Gunma University, School of Medicine