I have changed the specialty twice, which allows me to take advantage of having a larger number of 'drawers'. I graduated from the Department of Nuclear Engineering in 2000 and my postgraduate study was on the development of materials for luminescent radiation sensors (scintillators). I received the Presentation Award of the Japan Society of Applied Physics in 2002, the first prize in the university's student invention contest in 2004, and a PhD from the University of Tokyo in 2005. Until 2009, I worked as a postdoc at the National Institute of Radiological Sciences, where I developed a radiation detector for positron emission tomography (PET) scanners. I also investigated the angular deviation that imposes a physical limit with PET. Currently (since 2009), I am an assistant professor at the University of Tokyo, where I study the interaction between positronium and matter and was awarded the Young Investigator Award of the Physical Society of Japan in 2015. For the time being, I hope to work both on pure sciences in atomic physics and applied research to establish new PET methodologies.