**Meet the editor**

Mitsuru Nenoi graduated from Kyoto University, Graduate School of Sciences, Japan, in 1983. He started his career as a scientist at the National Institute of Radiological Sciences (NIRS), Japan. He received a PhD 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 the 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. He is now the director of the 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.
