Admitted
Japan (1977) and New York (1982)
Bar Association
Daini Tokyo Bar Association, New York State Bar Association
Education
The University of Tokyo (LL.B., 1974)
The Legal Training and Research Institute of the Supreme Court of Japan
New York University School of Law (M.C.J., 1981)
Publications
- "Growth Strategy 2017: Fine-tuning Japan's Banking Act for Fintech," Who's Who Legal: Japan 2017, Law Business Research Ltd. (2017) [Co-author]
- Theory and Practice of TMKs- Asset Liquidation Using TMKs, Kinzai Institute for Financial Affairs (2009) [Co-author]
- "Securtisation 2008/09 Country Q&A Japan"PLC Cross-border Handbooks: Finance Volume 2, Practical Law Company (2008) [Co-author]
- "Secured Lending 2008/09 Country Q&A Japan" PLC Cross-border Handbooks: Finance Volume 1, Practical Law Company (2008) [Co-Author]
- "Japan Overview" The Legal Media Group Guide to the World’s Leading Structured Finance and Securitization Lawyers, IFLR (2007) [Co-author]
- "Secured Lending 2007/08 Country Q&A Japan"PLC Cross-border Handbooks, Practical Law Company (2007) [Co-author]
- "Legal Aspects (of aircraft registered in Japan)" Airfinance Annual 2002/2003 [Co-author]
- "Legal Aspects of PFI Financing in Japan" Japan Now Open For Business, The Essential Investment Guide From Asia Law & Practice (1999)
- "A case of securitisation of bank loan assets in U.K.- Structure of Rose Fund" NBL No.618, Shojihomu (1997)
- "Legal Aspects of aircraft registered in Japan" Airfinance Annual 1994/95
- "Opinion on asset-backed CP - Discussion on taxation in connection with securitisation overseas of domestic debt obligations" NBL No. 517, Shojihomu (1993)
- "Relative rules for securitisation in the Cayman Islands" (Translation in Japanese) NBL No. 529, Shojihomu (1993)
- New Amendment Strengthens Shareholder Control" Asia Law (August, 1993)
- "International Banking, Japan" International Financial Law Review, Special Supplement (September, 1992)
Web Articles
- "View From the Top – An interview with Hiroo Atsumi, Senior Partner, Atsumi & Sakai," Top Ranked Legal (October 2024) [Interview]
- "Capacity to Find Solutions to a Wide Range of Complex Issues Borne out of Many Years of Practicing Diversity -Atsumi & Sakai-," Bengo4.com Career (April 2023) [Interview]
Seminars
- "Legal Issues associated with Securing Lease Receivables in Japanese Leveraged Lease Transactions—From the Lenders' Viewpoint", March 14, 1994, organized by the Business Law Institute (Shoji-Homu-Kenkyu-Kai)
- The Best Lawyers in Japan 2026
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Project Finance and Development Practice
- Real Estate Law
- Structured Finance Law
- Chambers Global 2025
- Banking & Finance: Domestic (Senior Statespeople)
- Chambers Asia-Pacific 2025 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Lexology Index Japan 2024
- Banking
- IFLR 1000 2024
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- Asia Business Law Journal The A-List: Japan's Top 100 Lawyers 2024
- Legal Icon
- The Best Lawyers in Japan 2025
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Project Finance and Development Practice
- Real Estate Law
- Structured Finance Law
- Chambers Global 2024 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Chambers Asia-Pacific 2024 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Who's Who Legal Japan 2023
- Banking
- asialaw Leading Lawyers 2024
Senior statesman- Banking and finance
- Capital markets
- IFLR 1000 2023
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- Asia Business Law Journal The A-List: Japan's Top 100 Lawyers 2023
- The Best Lawyers in Japan 2024
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Project Finance and Development Practice
- Real Estate Law
- Structured Finance Law
- Chambers Global 2023 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Chambers Asia-Pacific 2023 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- asialaw Leading Lawyers 2023
Senior statesman- Banking and finance
- Capital markets
- IFLR1000 32nd edition
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- The Best Lawyers in Japan 2023
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Project Finance and Development Practice
- Real Estate Law
- Structured Finance Law
- Chambers Global 2022 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- Chambers Asia-Pacific 2022 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- Who's Who Legal Japan 2021
- Banking
- asialaw Leading Lawyers 2022
Senior statesman- Banking and finance
- Capital markets
- The Best Lawyers in Japan 2022
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Project Finance and Development Practice
- Real Estate Law
- Structured Finance Law
- Chambers Global 2021 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- Chambers Asia-Pacific 2021 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- IFLR 1000 Financial and Corporate 2021
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- Who's Who Legal Japan 2020
- Banking
- asialaw Leading Lawyers 2021
Senior statesman- Banking and finance
- Capital markets
- Asia Business Law Journal The A-List: Japan's Top 100 Lawyers
- Chambers Global 2020 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- The Best Lawyers in Japan 2021
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Real Estate Law
- Structured Finance Law
- Chambers Asia-Pacific 2020 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- Who's Who Legal Japan 2019
- Banking
- IFLR 1000 Financial and Corporate 2020
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- asialaw Leading Lawyers 2020
Senior statesman- Banking and finance
- Capital markets
- Expert Guides 2019
- Banking
- Structured Finance and Securitisation
- Asian Legal Business (ALB) Japan Law Awards 2019
- Managing Partner of the Year
- The Best Lawyers in Japan 2020
- Asset Finance Law
- Banking and Finance Law
- Capital Markets Law
- Real Estate Law
- Structured Finance Law
- Chambers Global 2019 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- Chambers Asia-Pacific 2019 Leading Individual
- Banking & Finance: Domestic (Senior Statespeople)
- Capital Markets: Domestic: Securitisation & Derivatives (Senior Statespeople)
- IFLR 1000 Financial and Corporate 2019
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- Expert Guides 2018
- Banking
- Structured Finance and Securitisation
- Asialaw Profiles 2018 Leading Lawyers
- Banking & Finance
- The Best Lawyers in Japan 2019
- Asset Finance Law
- Banking and Finance Law
- Real Estate Law
- Structured Finance Law
- Chambers Global 2018 Leading Individual
- Banking & Finance (Senior Statesmen)
- Capital Markets (Senior Statesmen)
- The Legal 500 Asia Pacific 2018 Leading Individuals
- Banking and Finance
- Chambers Asia-Pacific 2018 Leading Individual
- Banking & Finance (Senior Statesmen)
- Capital Markets (Senior Statesmen)
- IFLR 1000 Financial and Corporate 2018
Leading Lawyers (Market leader)- Banking
- Capital markets: Structured finance and securitisation
- Who's Who Legal Japan 2017
- Banking
- Asialaw Profiles 2017 Leading Lawyers
- Banking & Finance
- Chambers Global 2017 Leading Individual
- Banking & Finance
- Capital Markets (Eminent Practitioner)
- The Best Lawyers in Japan 2018
- Asset Finance Law
- Banking and Finance Law
- Real Estate Law
- Structured Finance Law
- The Legal 500 Asia Pacific 2017 Leading Individuals
- Banking and Finance
- Structured Finance / Securitisation
- Chambers Asia-Pacific 2017 Leading Individual
- Banking & Finance
- Capital Markets (Eminent Practitioner)
- Expert Guides 2016
- Banking
- Structured Finance and Securitisation
- IFLR 1000 Financial and Corporate 2017 Leading Lawyers
- Banking
- Capital markets: Structured finance and securitisation
- Asset finance
- Asialaw Profiles 2016 Market-Leading Lawyers
- Banking & Finance
- Who's Who Legal Japan 2016
- Banking
- The Best Lawyers in Japan 2017
- Asset Finance Law
- Banking and Finance Law
- Real Estate Law
- Structured Finance Law
- Chambers Global 2016 Leading Individual
- Banking & Finance
- Capital Markets (Eminent Practitioner)
- Chambers Asia-Pacific 2016 Leading Individual
- Banking & Finance
- Capital Markets (Eminent Practitioner)
- The Legal 500 Asia Pacific 2016 Leading Individuals
- Banking and Finance
- Structured Finance / Securitisation
- IFLR 1000 Financial and Corporate 2016 Leading Lawyers
- Banking
- Capital markets: Structured finance and securitisation
- Expert Guides 2015
- Banking
- Structured Finance and Securitisation
- The Best Lawyers in Japan 2016
- Asset Finance Law
- Banking and Finance Law
- Real Estate Law
- Structured Finance Law
- Chambers Global 2015 Leading Individual
- Banking & Finance
- Capital Markets
- Chambers Asia-Pacific 2015 Leading Individual
- Banking & Finance
- Capital Markets
- The Legal 500 Asia Pacific 2015 Leading Individuals
- Banking and Finance
- Structured Finance / Securitisation
- IFLR 1000 2015 Leading Lawyers
- Banking
- Capital markets: Structured finance and securitisation
- Asialaw Profiles 2015 Leading Lawyers
- Banking
- Expert Guides Banking, Financial and Transactional Law 2014
- Banking
- Structured Finance and Securitisation
- The Best Lawyers in Japan 2014-2015
- Asset Finance Law
- Banking and Finance Law
- Real Estate Law
- Structured Finance Law
- Who's Who Legal Japan 2014
- Banking
- Capital Markets
- Chambers Global 2014 Leading Individual
- Banking & Finance
- Capital Markets
- Chambers Asia-Pacific 2014 Leading Individual
- Banking & Finance
- Capital Markets
- The Legal 500 Asia Pacific 2014 Leading Individuals
- Structured Finance / Securitisation
- Banking and Finance
- IFLR 1000 2014 Leading Lawyers
- Structured finance and securitisation
- Banking and finance
- Asialaw Profiles 2014 Leading Lawyers
- Banking
- Expert Guides Banking, Financial and Transactional Law 2013
- Structured Finance and Securitisation- Japan
- Best Lawyers 2013 "Best Lawyers"
- Asset Finance
- Banking and Finance Law
- Structured Finance
- Chambers Global 2013 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation & Structured Finance
- Chambers Asia-Pacific 2013 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation & Structured Finance
- Asian Legal Business (ALB) 2013 CLIENT CHOICE HOT 75
- IFLR 1000 2013 Leading Lawyers
- Capital markets: structured finance and securitization
- Banking
- Asialaw Profiles 2013 Leading Lawyers
- Asialaw Profiles 2013 Recommended Lawyers
- The Legal 500 Asia Pacific 2013 Leading Individuals
- Structured Finance / Securitisation
- Banking and Finance
- Asialaw Profiles 2012 Leading Lawyers
- Structured Finance
- Chambers Global 2012 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation & Structured Finance
- Best Lawyers 2012 "Lawyer of the Year"
- Asset Finance
- Best Lawyers 2012 "Best Lawyers"
- Banking and Finance Law
- Structured Finance
- Chambers Asia-Pacific 2012 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation & Structured Finance
- The Legal 500 Asia Pacific 2012 Leading Individuals
- Structured Finance / Securitisation
- Banking and Finance
- Capital Markets
- Projects and Energy
- IFLR 1000 2012 Leading Lawyer
- Capital Markets: Structured Finance and Securitization
- Banking
- Asialaw Profiles 2011 Leading Lawyers
- Structured Finance
- Corporate INTL 50 BEST Lawyers in Japan 2011
- Capital Markets Law
- Chambers Asia-Pacific 2011 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation & Structured Finance
- PLC Which Lawyer? 2011 Individual Recommendation
- Real Estate: Local Advice
- Banking and Finance: Local Advice
- Capital Markets: Debt and Equity
- Capital Markets: Securitisation
- Lawyer Monthly Leading LAWYER 100 Asia Pacific 2011
- Banking & Finance
- The Legal 500 2011 Leading Individuals
- Securitization
- Banking and Finance
- Projects and Energy
- IFLR1000 2011 Leading Lawyer
- Capital Markets: Structured Finance and Securitization
- Banking
- Asia Law Leading Lawyers — Japan, 2010
- Leading Lawyer — Securitization & Structured Finance
- Best Lawyers 2010 "Best Lawyers"
- Asset Finance
- Banking and Finance Law
- Structured Finance
- Legal Media Guides to the World’s Leading Lawyers 2010
- Structured Finance and Securitization
- Banking
- The Legal 500 2010 Leading Individual
- Banking and Finance
- Projects and Energy
- IFLR1000 2010 Leading Lawyer
- Banking
- Capital Markets — Structured Finance and Securitization
- Asia Law Leading Lawyers—Japan, 2009
- Leading Lawyer—Securitization & Structured Finance
- Best Lawyers 2009 "Best Lawyers"
- Asset Finance
- Banking and Finance Law
- Structured Finance
- IFLR1000 2009 Leading Lawyer
- Banking
- Capital Markets — Structured Finance and Securitization
- Chambers Asia 2009 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation & Structured Finance
- Legal 500 2009 Leading Individual
- Banking and Finance
- Projects
- AsiaLaw Leading Lawyers 2008
- Leading Lawyer — Securitization & Structured Finance
- Chambers Global 2008 Leading Individual
- Banking & Finance
- Capital Markets: Securitisation
- IFLR1000 2008 Leading Individual
- Banking and Finance
- Projects
- Legal Media Guides to the World’s Leading Lawyers 2008
- Securitization & Structured Finance
- Banking
- Project Finance
- PLC Which Lawyer? 2008 Leading Individual
- Banking: Lenders & Borrowers
- AsiaLaw Leading Lawyers 2007 Leading Lawyer
- Securitization & Structured Finance
- Chambers Global 2007 Band 1 Leading Individual
- Banking and Finance
- Capital Markets: Securitisation
- IFLR1000 2007 Leading Individual
- Banking and Finance
- Projects and Energy
- PLC Which Lawyer? 2007 Leading Individual
- Finance: Banking
- PLC Cross Border Finance: Secured Lending 2007/2008
- Leading Individual—Banking
- Recommended Individual—Debt Capital Markets
- AsiaLaw Leading Lawyers 2006 Leading Lawyer
- Securitization & Structured Finance
- Chambers Global 2006 Leading Individual
- Banking and Finance
- Capital
- Markets: Securitisation
- IFLR1000 2006 Leading Individual
- Banking and Finance
- Projects and Energy
- PLC Which Lawyer? 2006
- Leading Individual—Finance: Banking
- Highly Recommended Individual—Corporate Real Estate
- Recommended Individual—Finance: Debt Finance