Mitsuru Nenoi graduated from Kyoto University, Graduate School of Sciences, Japan in 1983, and started his career as a scientist at National Institute of Radiological Sciences (NIRS), Japan. He received a Ph.D from Kyoto University in 1992 for the study on induced accumulation of polyubiquitin gene transcripts after exposure to ultraviolet light and treatment with 12-O-Tetradecanoylphorbol 13-acetate. In 1991, he stayed at University of Cincinnati College of Medicine, USA as a visiting scientist, and was involved in the study of mechanisms for transcriptional regulation of small heat shock genes of Drosophila. Dr. Nenoi is now a Director, Radiation Risk Reduction Research Program, Research Center for Radiation Protection of NIRS. His research interest is radiation biology, especially on the mechanism for gene regulation after exposure to ionizing radiation.