He received his BA degree in Literature from Ritsumeikan University in 2001, and his MS/PhD degrees in Informatics from Institute of Information Security in 2007 and 2010. He was admitted to Institute of Information Security after engaging in Unix/Linux server operation and maintenance support service in industries in 2000-2005, and has involved in the research of systems security, especially in access controls and security policy description languages as an assistant professor since 2010 and as an associate professor since 2014. He was also an academic visiter at Royal Holloway, University of London, Information Security Group during the year 2014. He is on the ICSS, CSEC committee and a member of IPSJ, IEICE, IEEE and ACM.