Dr. Masamichi Chino is the Managing Director of Quantum Beam Science Directorate, National Institutes for Quantum and Radiological Science and Technology, Japan. He has 37 years of experience in atmospheric environment research. In particular, he dedicated his time in Japan Atomic Energy Agency till March 2016 to develop computer-based emergency response systems SPEEDI and WSPEEDI to predict in real-time the atmospheric dispersion and deposition of radionuclides discharged accidentally into the environment. SPEEDI and WSPEEDI have been used for Japanese government for domestic and overseas accidents. During the Fukushima Daiichi Nuclear Power Station accident in 2011, he was involved in the activities of the Nuclear Safety Commission of Japan and engaged in the estimation of atmospheric release amounts, dispersion and deposition of radionuclides by using SPEEDI and WSPEEDI. A series of papers on the reverse estimation of release amounts and atmospheric dispersion simulation are widely referred by not only many researches related to the Fukushima accident in the world but international organizations, e.g., UNSCEAR and IAEA.