2000 – 2002Resident, oto-rhinolaryngology, Department of oto-rhinolaryngology head and neck surgery, Juntendo University Hospital, Tokyo 2002 – 2008.3Oto-rhinolaryngology Trainee, Department of oto-rhinolaryngology head and neck surgery, Juntendo University Hospital, Tokyo (Supervisor: Prof. Katsuhisa Ikeda) 2008.4-2010.4Visiting Scientist, Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center. (Supervisor: Prof. Luka Milas) 2010.5-2012.3 Assistant professor, Department of oto-rhinolaryngology head and neck surgery, Juntendo University Hospital, Tokyo (Supervisor: Prof. Katsuhisa Ikeda) 2013.4-2018.3 Head of Medical stuff, Department of Head and neck oncology, National cancer center hospital Tokyo 2018.4-2021.9 Associate professor, Department of Otorhinolary