Julie H. McConnell focuses her practice on representing clients in complex litigation before federal, state and local agencies, courts and courts of appeals.
Julie defends companies in individual, multi-plaintiff and class action litigation in disputes involving Title VII of the Civil Rights Act, the Americans with Disabilities Act (ADA), the Fair Labor Standards Act and other federal and state employment and accessibility statutes and tort claims. Julie also represents employers in litigation involving disclosure of trade secrets, violation of noncompetition agreements and whistleblower disputes. Additionally, Julie advocates for employers before the National Labor Relations Board in union organizing campaigns and unfair labor practice cases.
- Prevailed at bench trial and on appeal to the US Court of Appeals for the Eleventh Circuit on behalf of one of the world’s leading mass media and entertainment conglomerates in landmark case involving claims under the Americans with Disabilities Act
- Obtained summary judgment on behalf of Fortune 100 company on dozens of individual common-law tort and disability discrimination claims brought under Title III of the ADA and California state law
- Represented government contractor and obtained dismissal without leave to amend of whistleblower protection claim under Virginia law
- Best Lawyers: Ones to Watch in America, Litigation – Labor and Employment, 2026
- Legal 500 US 2023
- American University Washington College of Law, JD, cum laude
- Vanderbilt University, BA, magna cum laude
- District of Columbia
- Virginia
- US District Court for the District of Columbia
- US District Court for the Eastern District of Virginia

Alex Cheng-Yi Lee
Alex Cheng-Yi Lee focuses his practice on US and international tax planning and transactions involving US and non-US multinational companies, private equity funds, and entrepreneurial families.
- Represented Leo Messi in connection with the formation of the Más+ by Messi sports beverage business, an international joint venture between Mr. Messi and Mark Anthony Presents
- Represented Krispy Kreme in the sale of its majority ownership stake of Insomnia Cookies
- Represented Caribou Coffee in the transaction to license its brand in the consumer packaged goods and food service channels to JDE Peet’s
- Georgetown University Law Center, LLM, Taxation
- Georgetown University Law Center, JD, BS
- National Taiwan University, BA
- District of Columbia
- English
- Chinese (Mandarin)

Robert Lamkin
Rob Lamkin represents energy trading firms, electric power generators, renewables project developers and other energy industry participants in energy trading and energy regulatory matters, including matters relating to compliance with CFTC regulation of swaps under the Dodd-Frank Act.
- Represented an energy trading and marketing entity in negotiating structured energy trading transactions, including lien-based credit structures and complex hedging arrangements including heat rate call option and revenue put option transactions
- Represented wind farm developer in negotiation of proxy revenue and proxy generation swap transactions and negotiation of lien-based structure in connection with same
- Represented a power producer in the development and negotiation of an energy management agreement governing a significant number of electric generation facilities
- The Best Lawyers in America, Energy Law, 2023-2024
- The Legal 500, Recommended, 2015-2016, 2021, 2023
- Catholic University of America Columbus School of Law, JD
- Stanford University, BA
- District of Columbia
- Maryland
- New York

Christine Corkran Kretkowski
Christine Corkran Kretkowski advises clients on strategic transactions, including mergers, acquisitions, divestitures and joint ventures. She also focuses her practice on large-scale global corporate reorganizations, assisting multinational clients prepare for future strategic transactions and in their post-acquisition integration strategies.
- Legal 500 US, Recommended, 2021, 2024
- Franklin & Marshall College Alumni Association Board of Directors, 2012 to 2018; president, 2016 to 2017
- George Washington University Law School, with honors
- Franklin & Marshall College, BA, magna cum laude
- District of Columbia
- Maryland

Stephen P. Kranz
Stephen (Steve) P. Kranz is a tax lawyer who solves tax problems differently. Over the course of his extensive career, Steve has acquired specific skills and developed a unique approach that helps clients develop and implement holistic solutions to all varieties of tax problems. He combines strategic thinking with effective skills for the courtroom, the statehouse and the conference room.
- On behalf of Microsoft Corporation, won the pivotal case in the District of Columbia challenging the jurisdiction’s transfer pricing audit methodology
- On behalf of a Firm client, obtained a complete settlement concession from the District of Columbia resulting in zero additional tax due on a substantial transfer pricing assessment
- Legal 500 US, Recommended, 2018, 2022 and 2024–2025
- Thomson Reuters, Stand-out Lawyer – independently rated lawyers, 2023
- International Tax Review, World Tax, 2016-2025
- Recognized by Netchoice as the “Tax Master”
- State Tax Notes 2011, Top 10 Tax Lawyers and Top 10 individuals who influenced tax policy and practice
- Business Advisory Council, Streamlined Sales Tax Governing Board, former president
- District of Columbia Bar, State and Tax Committee, member and former chair
- Tax Foundation, board of directors
- Drake University Law School, JD, with honors, Order of the Coif
- University of North Dakota, BA, magna cum laude
- District of Columbia
- Minnesota
- North Dakota

Marie-Muriel Barthelet
Marie-Muriel Barthelet advises founders and managers, companies, and private equity funds on all aspects of their corporate law issues related to national and international mergers and acquisitions operations, as well as leveraged buyouts and other private equity transactions.
Prior to joining the firm, Marie-Muriel was an associate at another leading international law firm.
- The Best Lawyers in France, Best Lawyer, Private Equity Law, 2025 & 2026
- Paris-Panthéon-Assas University, Master’s, Business Law
- Paris 1 Panthéon-Sorbonne University, Master’s, English and American Business Law
- University of Oxford/University Paris II Panthéon-Assas
- Paris
- French
- English

Raymond A. Jacobsen, Jr.
Raymond (Ray) A. Jacobsen, Jr., advises clients on mergers, acquisitions, and complex antitrust litigation. He has significant experience in the defense, medical devices, biotech, consumer product, energy, and healthcare industries.
- Represented Rochester General Health System and Unity Health System, successfully securing Federal Trade Commission (FTC) approval in the merger of two of the three hospitals in Rochester, New York
- Defended Amgen in a monopolization case, defeating preliminary injunction seeking to enjoin a bundled discount arrangement on pharmaceuticals (Ortho Biotech v. Amgen (D.N.J.))
- Global Competition Review, GCR 100, 2024-2026
- Best Lawyers in America, Antitrust Law (2006-2027), Litigation – Antitrust, 2006-2027
- Chambers USA, 2005-2026
- Legal 500 US, Leading Lawyer in Antitrust – Merger Control, 2024-2025
- American Bar Association
- Georgetown University Law Center, JD
- University of Delaware, BA, cum laude
- District of Columbia

Marshall E. Jackson, Jr.
Provides transactional and regulatory counseling to clients in the healthcare and life sciences industries
Represents investors and their portfolio companies on M&A, joint ventures, and strategic affiliations
Represents physician practices and other health organizations on corporate, regulatory compliance, and governance matters
Advises digital health and health tech clients working at the intersection of healthcare, software, analytics, technology, AI, and electronic data
Marshall E. Jackson, Jr., provides transactional and regulatory counseling to clients in the healthcare and life sciences industries. Drawing on his transactional background and extensive healthcare regulatory experience, he provides practical, comprehensive counsel on the complex strategic and operational issues facing healthcare and life sciences companies and their investors.
Transactions and affiliations
- Represented General Atlantic in several health care and health tech transactions, including its:
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- $3 billion acquisition of TEAM Services Group, a national provider of personal care and household employment services across the United States
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- Acquisition of Eventus WholeHealth, an integrated primary and behavioral healthcare delivery organization that provides medical services to patients in long-term care facilities
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- Acquisition of Vi Labs, an enterprise data analytics platform
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- Acquisition of Suvida Healthcare, a value-based primary care platform
- Chambers USA, 2026
- Thomson Reuters, Stand-Out Lawyer – independently rated lawyers, 2026
- Legal 500 US, Recommended, 2022, 2024-2025
- The Best Lawyers: Ones to Watch in America, Healthcare Law, Washington, DC, 2022-2024
- Minority Corporate Counsel Association, Rising Star, 2023
- The National Law Journal, DC Rising Star, 2022
- The National Black Lawyers, Top 40 Under 40, 2019
- American Health Lawyers Association, Pro Bono Champion, 2014, 2015
- McDermott Will & Schulte, Digital Health & Health Tech Group, co-head
- American Health Lawyers Association, member
- American Bar Association, Health Law Section, member
- Nanci’s Gift, Inc., board member
- University of Maryland Francis King Carey School of Law, JD, Order of the Barristers
- United States Military Academy, BS
- District of Columbia
- Maryland
- US Court of Appeals for Veterans Claims
- English

Sarah P. Hogarth
Sarah P. Hogarth is a member of the Firm’s Supreme Court & Appellate Litigation and Government & Regulatory Litigation practices. She briefs and argues appeals and critical motions, litigates affirmative cases challenging federal and state government action and advises on legal strategy and dispositive motions in trial courts or before administrative tribunals.
- Successfully defended the invalidation of a Puerto Rico law regulating the rates that Medicare Advantage plans must pay providers on federal preemption grounds (MMAPA v. Emanuelli-Hernandez (1st Cir.))
- Won reversal of judgment dismissing Sherman Act Section 1 and Clayton Act Section 7 claims (Vasquez v. Indiana University Health, Inc. (7th Cir.))
- Preserved dismissal of lawsuits asserting claims covered by the landmark settlement of more than 10,000 mass tort cases against the City of New York and private contractors following the 9/11 terrorist attack (In re World Trade Center Lower Manhattan Disaster Site Litig. (2d Cir.))
- Won complete cross-appeal victory, securing reversal of district court order declining to enforce a settlement agreement (Serta Simmons Bedding LLC v. Casper Sleep Inc. (Fed. Cir.))
- Preserved a complete jury verdict and multimillion-dollar award (US Conference of Mayors v. Great-West Life & Annuity (D.C. Cir.; D.D.C))
- Best Lawyers: Ones to Watch in America, Appellate Practice, 2026-2027
- Legal 500 US, Appellate: Courts of Appeals/Appellate: Supreme Courts, 2021 and 2023-2025
- District of Columbia Courts, Capital Pro Bono Honor Roll, 2023
- Super Lawyers Washington DC, Rising Star in Appellate, 2019-2020
- Law360, Appellate Editorial Advisory Board, 2024-2025
- Notre Dame Law School, JD, summa cum laude
- Michigan State University, BA, with honors
- District of Columbia
- Indiana
- Maryland
- US Court of Appeals for the First Circuit
- US Court of Appeals for the Second Circuit
- US Court of Appeals for the Third Circuit
- US Court of Appeals for the Fourth Circuit
- US Court of Appeals for the Fifth Circuit
- US Court of Appeals for the Seventh Circuit
- US Court of Appeals for the Eighth Circuit
- US Court of Appeals for the Ninth Circuit
- US Court of Appeals for the Tenth Circuit
- US Court of Appeals for the District of Columbia Circuit
- US Court of Appeals for the Federal Circuit
- US Court of Appeals for Veterans Claims
- US District Court for the District of Columbia
- US District Court for the District of Maryland
- US District Court for the Northern District of Indiana
- US District Court for the Southern District of Indiana

Laurent Ayache
Laurent Ayache is co-head of the Regulatory Practice in the Firm’s Paris office. He advises clients on public, administrative and regulatory law, including issues in connection with competition and public-sector matters. He focuses his practice on government contracts (public procurements, public service concessions, public-private partnerships and government property leases), public corporations (governance, privatization and changes in status) and on antitrust and industry regulation issues. His practice also includes litigation related to regulated industries such as energy (electricity and gas), electronic communications, airports, transportation (railway, road and sea), public housing, drinking water and sanitization.
- The Legal 500 EMEA, Recommended, 2022-2026
- Chambers France, Public Law, 2026
- The Best Lawyers in France, 2022-2026
- Chambers Europe, France: Public Law, 2023-2024
- IFLR1000, Project Development, M&A, 2022-2023
- Paris-Panthéon-Assas University, LLM (DESS), European Business Law
- Paris 1 Panthéon-Sorbonne University, LLM (DESS), Public Economic Law
- Paris
- French
