1983 Apr–1986 Aug	Resident in Radiology, University Hospital of Tsukuba
1986 Sep–1986 Nov	Visiting doctor in Head & Neck Surgery, National Cancer Center
1986 Dec–1988 June	Resident in Radiation Oncology, University Hospital of Tsukuba
1988 July–1992 Mar	Chief radiation oncologist, Ibaraki Prefectural Hospital & Cancer Center
1992 Apr–2000 Mar	Assistant Professor in Proton Medical Research Center, University of Tsukuba
2001 Apr–2007 Oct	Chief radiation oncologist, Ibaraki Prefectural Hospital & Cancer Center
2007 Nov–2008 Nov	Director, Dep. of Radiation Oncology, Ibaraki Prefectural Hospital & Cancer Center
2008 Dec–2010 Nov	Associate professor, Proton Medical Research Center, University of Tsukuba
2010 Dec–present	Clinical professor of Tsukuba University Hospital