I am an assistant professor at Software Engineering Laboratory in Nara Institute of Science and Technology (NAIST) in Japan. My main research area is Software Engineering. I am particularly interested in Open Source Software Engineering, Mining Software Repositories, Software Maintenance, Empirical Software Engineering and Social Software Engineering. I mine historical project data and apply Data Mining, Artificial Intelligence and Statistical Analysis techniques in order to support for open source software developers and users. Some of my research has been done in collaboration with open source software developers.