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  • International Arbitration & Dispute Resolution
  • Complex Litigation & Dispute Resolution
  • Antitrust & Competition
  • Employment Law & Litigation
  • Intellectual Property

Kei Kato Managing Associate International Arbitration & Dispute Resolution, Complex Litigation & Dispute Resolution


Kei Kato is a managing associate and member of the Complex Litigation and Dispute Resolution Group in the Tokyo office.

Kei focuses on intellectual property, antitrust, product liability, employment, compliance and other commercial disputes, including litigation and international arbitration, for both domestic and non-Japanese companies.

Prior to joining Orrick’s Tokyo office, Kei was an associate at Nishimura and Asahi.

He will be attending Columbia University from 2019 to 2020.



  • Energy
  • Infrastructure
  • Renewable Energy
  • Japan

Gohshun Kawamura Associate Energy, Infrastructure


Gohshun Kawamura is an associate in Orrick’s Tokyo office and a member of the Energy and Infrastructure Group.

He focuses on cross-border energy and infrastructure projects, advising foreign and domestic energy investors, project developers, and financial institutions.

Prior to joining Orrick Tokyo Office, he was an assistant judge at the Tokyo District Court and the Matsuyama District Court.



  • Banking & Finance
  • M&A and Private Equity
  • Direct Lending
  • Debt Capital Markets

Anthony Kay Partner Banking & Finance, M&A and Private Equity


Anthony has a wealth of experience in complex cross-border finance matters and is well regarded in the market.

He acts for sponsors and their portfolio companies, credit funds, banks, direct and alternative lenders and other financial institutions on financing matters generally but with a particular focus on acquisition, leveraged and private equity finance and direct lending.


  • Technology Companies Group
  • Corporate

Kevin Kearney Managing Associate Technology Companies Group, Corporate

Silicon Valley

Kevin is a managing associate in Orrick’s Technology Companies Group. He advises technology companies in various sectors and has significant experience with venture capital financings, mergers & acquisitions, debt financings and general corporate representation.

Kevin is passionate about technology and serves on the board of the “Orrick Labs” committee and is a member of Orrick’s associate technology committee.

Kevin has recently represented companies being sold in the following transactions: Wavefront to VMware; Nervana to Intel; Frame to Nutanix; AppFormix to Juniper Networks; Eat24 to GrubHub; Outward to Williams Sonoma; PernixData to Nutanix; Arkin Net to VMware; FoodyDirect to Goldbelly; BitRock to VMware.

Kevin advises high-technology businesses and venture capital investors on corporate governance, securities offerings, liquidity transactions and related matters.



  • Supreme Court & Appellate

Jennifer Keighley Senior Associate Supreme Court & Appellate

New York

Jennifer is a member of the firm's Litigation Group and Supreme Court and Appellate practice. She represents clients in appellate and trial-level litigation in federal and state courts across the country. She focuses on dispositive motions and high stakes appeals.

Her experience covers a wide range of substantive areas, including constitutional law and statutory interpretation, labor and employment, immigration, healthcare law, privacy law, and complex commercial litigation.  

Prior to joining Orrick, Jennifer was a Staff Attorney at a national nonprofit. While there she participated in all aspects of litigation, arguing and briefing dispositive motions and examining witnesses at trial. 

Jennifer graduated from Yale Law School, where she was an Editor on the Yale Law Journal. Immediately following law school, she served as a law clerk to Judge Kim McLane Wardlaw of the United States Court of Appeals for the Ninth Circuit.



  • M&A and Private Equity
  • Technology Companies Group
  • Life Sciences

Don Keller Partner M&A and Private Equity, Technology Companies Group

Silicon Valley

Don Keller, a partner in the Silicon Valley office, is a member of the Technology Companies Group.

Don advises high growth technology companies, public companies, venture capital firms and investment banks. He has advised clients on more than 60 public offerings, 75 acquisition transactions and several hundred venture financings.

Chambers USA recognized Don for his work in the areas of Venture Capital and Startups & Emerging Companies, noting he "is valued for his knowledge of venture capital firms and his strength in advising technology companies on public offerings, acquisition transactions and venture financings. One client insists that 'I would not dream of starting a company without him as my outside counsel.'" (2018)  He is ranked Band 3 for both Startups & Emerging Companies and Venture Capital (2019).

Don has held many leadership positions at Orrick. Don currently leads Orrick’s Technology and Life Sciences Sector, which is one of the three focus areas (along with energy and finance) for the firm. Don is a former member of Orrick’s Board of Directors, served as head of the firm’s global corporate practice,  served as head of the firm’s Silicon Valley Office and served as co-head of the firm's diversity efforts. 

Don also previously served for many years on the Executive Committee of Venture Law Group.

Don has recently represented companies being sold in the following transactions: Wavefront to VMware; Nervana to Intel; TOA to Oracle; Altiscale to SAP; Mainframe2 to Nutanix; Sailthru to Campaign Monitor; Twin Prime to Salesforce; 3Scale to Red Hat; Vendavo to Francisco Partners; FoodyDirect to Goldbelly; Yieldex to AppNexus; and LS9 to Renewable Energy Group.

Don has worked on transactions for Google (Nasdaq GS: GOOG), Oracle (Nasdaq GS: ORCL), Tibco (Nasdaq GS: TIBX), Adaptec (Nasdaq GS: ADPT), Shutterfly (Nasdaq GS: SFLY), Martha Stewart Living Omnimedia (NYSE:MSO), Sum Total Systems (Nasdaq GS: SUMT) and Rambus (Nasdaq GS: RMBS). He also has represented many investment banking clients in public offering transactions, including representing Goldman, Sachs & Co. in offerings for many issuers.

Don is a past member of the Board of Overseers of Boston College Law School.



  • Technology Companies Group
  • Fintech
  • Banking & Finance
  • Blockchain and Cryptocurrency
  • Energy

Rebecca Kellner Associate Technology Companies Group, Fintech


Rebecca is an associate in the financial services regulatory team and provides advice on a broad range of financial regulation.

Rebecca has worked with regulated companies and financial institutions on, among other things, authorisation, outsourcing, systems and controls, payment services, e-money, consumer credit and anti-money laundering regulations. She also works with clients in the Fintech space, including providing advice on crypto-currencies and ICOs.



  • Supreme Court & Appellate

Karim J. Kentfield Senior Associate Supreme Court & Appellate

San Francisco

A former Supreme Court, D.C. Circuit, and Ninth Circuit clerk, Karim is a member of Orrick's Supreme Court and Appellate practice.

Before joining Orrick, Karim served as a law clerk to Justice Ruth Bader Ginsburg, Judge Sri Srinivasan of the U.S. Court of Appeals for the District of Columbia Circuit, and Judge William A. Fletcher of the U.S. Court of Appeals for the Ninth Circuit.  Karim also practiced tax law as an associate at another major international law firm.  Before law school, Karim worked as a software engineer.


  • Public Finance

John Keohane Senior Counsel Public Finance

New York

John J. Keohane, senior counsel in the New York office, is a member of the Public Finance Group, which ranks first in the nation in the dollar volume of financings for which it serves as bond counsel and underwriters counsel.

John has extensive experience in the area of municipal finance. Recently he has concentrated his practice on financings for student loans and housing, but he also has considerable expertise in financings for hospitals, stadiums, industrial development projects, and educational facilities, as well as in tax receivable financings.

Prior to joining Orrick, he was a partner at Hawkins, Delafield & Wood. Prior to that he was an investment banker, an officer of a debt-issuing state agency, and a research director for various committees of the New York State Legislature.

Anne-Sophie Kerfant Partner Tax


Anne-Sophie Kerfant, a lawyer specializing in tax law and employee savings plans, is a member of the Tax group at Orrick Rambaud Martel in Paris.

She advises French and foreign industrial companies and financial institutions on financing transactions (capital markets and structured finance), mergers and acquisitions in France and abroad, as well as on restructurings.

She is also specialized in setting up employee shareholding plans for employees and high-level executives of French and foreign companies.

In addition, Anne-Sophie assists natural persons with the management and conveyance of their assets and liabilities, and follows up on their tax inspections and tax litigation.

After having started her career in the tax management department of Ford France and spending 13 years at Shearman & Sterling, Ms. Kerfant joined Orrick Rambaud Martel in 2007 and has been Office leader of the Paris office between 2014 and 2018.



  • White Collar, Investigations, Securities Litigation & Compliance
  • Complex Litigation & Dispute Resolution

Lauren Kessler Associate White Collar, Investigations, Securities Litigation & Compliance, Complex Litigation & Dispute Resolution

San Francisco

Lauren is a litigation associate in Orrick’s San Francisco office. Her practice spans cybersecurity and privacy matters, trade secret defense and enforcement, complex commercial disputes, government and internal investigations, and regulatory enforcement actions.

Lauren’s cybersecurity and privacy experience includes defending companies against class action litigation and contractual disputes following the announcement of cybersecurity and privacy incidents, as well as counselling clients on incident response and remediation.

In her commercial practice, Lauren represents companies as both plaintiffs and defendants in a wide range of civil disputes including claims of trade secret misappropriation, breach of contract, and breach of fiduciary duty. Lauren also has experience defending individuals and companies against investigations and subsequent enforcement actions brought by the SEC and OCC. 

Lauren is passionate about her pro bono practice and community service. Lauren will soon argue before a California Court of Appeal to have her client’s life sentence vacated due to fundamental changes in California’s felony murder law. Lauren is also representing a Guatemalan father and daughter seeking Federal Tort Claims Act relief after they were forcibly separated at the U.S. border while seeking asylum. In addition, the Justice & Diversity Center of the Bar Association of San Francisco recognized Lauren as an Outstanding Volunteer in Public Service in 2018 for her work helping homeless clients clear outstanding warrants barring them from access to federal benefits.