Japan (1993)

Bar Association

Daini Tokyo Bar Association


Keio University (LL.B., 1974)
Keio Law School, coursework completed without degree (1979)
Ph.D. in Law (Keio University, 1990)


Assistant Professor, Keio University (1981-1985)
Associate Professor, Keio University (1985-1990)
Professor, Keio University (1990-2014)
Visiting scholar, University of Michigan (1979-1980)
Visiting scholar, University of California, Berkley (1980-1981)
Visiting scholar, Faculty of Law, Thammasat University (1988)
Yamada Ozaki Law Office (1993-May 2017)
Professor emeritus, Keio University (2014-)


Committee member, Citizen Judge System Enforcement Promotion Center
Board Member (former chairman), NPO Institute of Digital Forensics
Refugee Examination Counselor
Round-table chairman, Matters Relating to Anti-Money Laundering Measures (National Police Agency)
Council of Experts, Countermeasures Against Cyber Attacks (The Center for Financial Industry Information Systems)
Board member, The Japan Road Traffic Information Center
Councilor, The Center for Financial Industry Information Systems
Academic advisor, the Asia Crime Prevention Foundation
Special adviser (former president), The Association of Certified Fraud Examiners (ACFE Japan)
Development Committee Member, Basic Policy of Information Security (2nd Edition) of the National Center of Incident Readiness and Strategy for Cybersecurity
Chairman, Kawasaki City, Administrative Appeals Review Board
Member, Personal Information Protection Commission and the IT Strategic Headquarters, the Prime Minister of Japan and Cabinet
Committee member of “Academic Experts Committee for Open APIs in Financial Institutions,” The Center for Financial Industry Information Systems (FISC) (June 2018-October 2018)


  • Handbook on Decisions on Application of Laws by Courts: Penal Code Edition [3rd Edition], Tokyo Horei Publishing (2022)

  • Now I Know! Basis of Investigation Procedure Laws, Tokyo Horei Publishing (2021)

  • Criminal Proceedings (5th edition), Keio University Press Inc. (2021)
  • Introduction to Special Criminal Law (1st edition), Keio University Press Inc. (2020)
  • "Deciphering from Talks: Cyber Securities and Laws," edited by Hisamichi Okamura, Shojihomu Co., Ltd., (2019) [Co-author]
  • "Learning Digital Forensics from the Basics: From an Introduction to a Practical Response," JUSE Press. Ltd., (2019) [Co-author]
  • "Useful Science Knowledge for Attorney Services (Series No. 5): Digital Forensics," Jiyu to Seigi (Liberty & Justice) Vol.69 No.9, the Japan Federation of Bar Associations (2018)
  • "Research Study on Recent Trends of Data Protection Acts in Other Countries,” Personal Information Protection Commission (2018) [Co-author]
  • "Cybersecurity and Criminal Law," NBL No.1106, Shojihomu (September, 2017) 
  • “Safety and Law in Cyberspace,” Sandai law review Vol.50 No.3 & 4 (2017)
  • “Regarding Article 17 of the Medical Practitioners’ Act: Life-Saving Emergency Training by Dentists and “Medical Activities,” Sandai law review Vol.49 No.4 (2016)
  • "Digital Forensics and Evidence in Criminal Cases," Sandai law review Vol.49 No.1 (2015)
  • "Information Security and Legal Protection—from the Criminal Law perspective," Sandai law review Vol.88 No.2 (2015)
  • “Reading ‘Panel Discussion Reports related to Countermeasures against Money-Laundering’,” Ginko Homu No. 778 (2014)
  • “On Responses to Digital Attacks,” Financial Industry Information Systems No.333 (2014)
  • “Countermeasures against Money-Laundering in the Context of Client Management,” in the book "Hiroshi Kawabawa Sensei Memorial Essay Collection Vol.2 (2014)
  • "A Horizon for Money-Laundering Countermeasures Adapting to Changes in Social Circumstances," Turnaround & Credit Management Vol.25 No.4 (2012)
  • "Corporate Risk & Governance: Ways of Dealing with Digital Attacks and Corporate Risk," Turnaround & Credit Management Vol.25 No.4 (2012)
  • “Overview of ‘Panel Discussion Papers Regarding Ways for Businesses to Manage Clients to Prevent Money-Laundering’,” Weekly Financial Affairs No.62 (2010)
  • Basic Knowledge of Criminal Law Practice and Introduction to Special Criminal Law (2nd edition), Keio University Press Inc. (2019)
  • Criminal Proceedings (4th edition), Keio University Press Inc. (2017)
  • Basic Knowledge of Criminal Law Practice and Introduction to Special Criminal Law, Keio University Press Inc. (2015)
  • Criminal Procedure Law (2nd edition), Sanseido Co., Ltd. (2009)
  • Criminal Procedure Law (S series, 5th edition), Yuhikaku Publishing Co., Ltd. (2013) [Co-author]
  • Easy Criminal Procedure Law (6th edition), Hougakushoin (2013)
  • Practical Examples of Criminal Procedure Law,  Hougakushoin (2013) [Co-author]
  • Handbook of Pseudo Judgments of Criminal Law, Tokyo Horei Publishing Co., Ltd. (2011) [Co-author]
  • Crossovers of Civil Procedure Law and Criminal Procedure Law, Hougakushoin (2010) [Co-author]
  • How is a Crime Judged?, Seirin Shoin (2003) [Co-author]
  • High-Tech Crime and Criminal Procedures, Keio University Press Inc. (2001)


  • “Battle with the Unseen** - The Possibility of Tracing Clues Left Behind and Digital Forensics,” at the event entitled “14th Digital Forensic Community 2017 in Tokyo,” hosted by NPO Institute of Digital Forensics and Digital Forensic Community, 2017 Executive Committee Member, December 11 and 12
  • The 14th Information Security Culture Award (2018)
  • The 8th Telecommunications Advancement Foundation Award (Telecom Social Science Award) (1993)
  • Gijuku Prize (1992)