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  • Oil & Gas
  • Energy
  • M&A and Private Equity
  • Emerging Markets
  • Africa
  • Latin America

Joanna Kay Of Counsel Oil & Gas, Energy


Joanna Kay specialises in international oil and gas transactions, including upstream operations, project development, mergers and acquisitions and gas and LNG trading and storage arrangements.

Joanna advises clients on a wide range of upstream and midstream oil and gas agreements including concessions, AMIs, farm-ins and SPAs, royalties, operating and unitisation agreements, service and drilling contracts as well as transportation and sales agreements.

Joanna has worked in house as well as in private practice, including at Tullow Oil plc where she focused on upstream development projects and frontier exploration opportunities in Africa, Europe and the North Atlantic region. Joanna is also a committee member of the UK Energy Lawyers Group.



  • 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.



  • M&A and Private Equity

Guillaume Kessler Partner M&A and Private Equity


Guillaume Kessler is an M&A and private equity lawyer in Orrick's Paris office.

Guillaume advises on corporate finance transactions, including public and private domestic and cross-border mergers and acquisitions, takeovers, take privates, private equity and venture capital, restructurings and international joint ventures. He acts for French and international clients, including public and private companies, private equity houses and investment banks across a wide range of sectors, including tech, e-commerce, media and retail.

Recently, Guillaume advised:

  • Arjowiggins: sale of Arjowiggins Healthcare (Sterimed) to Meeschaert Private Equity;
  • Alpha Private Equity: sale of MK Direct Group (Françoise Saget / Linvosges) to Eurazeo PME
  • Neo Investment Partners: partnership with La Maison Plisson and Experimental Group;
  • Valco Group (Argos Soditic): build-up acquisition of D2FC from TCR Capital;
  • acquisition of from Lagardère Active
  • ITV: acquisition of Tetra Media Studio
  • Doctissimo: acquisition of Animalbox

Most recently, Guillaume advised Groupe Bertrand on the restructuring and acquisition of Groupe Flo.


  • 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 an associate in the San Francisco office and a member of Orrick's General Litigation group.

Lauren represents individuals and multinational companies in a variety of matters including government investigations, white collar criminal defense, and complex civil litigation.



  • Cyber, Privacy & Data Innovation
  • Internet of Things

Kyle Kessler Managing Associate Cyber, Privacy & Data Innovation, Internet of Things

Los Angeles

For Kyle Kessler, data privacy is where her passion for the law and for cutting-edge programs meets technology. With a background in marketing, public relations and communications, she translates marketing concepts into legal terms. Kyle brings more than a decade of business acumen and experience to her work, and companies turn to her for advice that blends practical business strategies with in-house and outside counsel perspectives.

As a privacy advisor, Kyle is undaunted by the complexity of state, federal and international data privacy and security requirements. She evaluates and advises clients on data collection, storage, use and transfer, as well as breach laws and regulations. Kyle advises on the Children’s Online Privacy Protection Act (COPPA), California Online Privacy Protection Act (CalOPPA), the new California Consumer Privacy Act of 2018 (CCPA) and on the EU General Data Protection Regulation (GDPR) from a U.S. perspective.

Kyle also advises and collaborates with her clients on general consumer protection and marketing/advertising matters. For instance, she regularly reviews marketing assets to ensure legal compliance across all channels. She also advises on unfair and deceptive trade practices, compliance issues relating to the Federal Trade Commission and the National Advertising Division (NAD) of the Better Business Bureau, the Fair Credit Reporting Act (FCRA), and the Gramm-Leach-Bliley Act (GLBA), as well as on other state and federal laws.

Before joining Orrick, Kyle was an in-house attorney at one of the Forbes 100 Largest Private Companies, and she has experience in the retail industry working in, among other things, data protection, incident response, unfair and deceptive trade practices and consumer-protection matters.

Kyle is an active member of the International Association of Privacy Professionals (IAPP), the LGBT Bar Association of Los Angeles and Women in Security and Privacy (WISP).