Robert (Robbie) Barton represents clients as they navigate their most significant and sensitive family disputes. Clients turn to Robbie when complex family conflicts, fiduciary issues, and multigenerational wealth disputes require sophisticated litigation strategy, discretion, and practical judgment.

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• Prevailed on a multi-week bench trial defending claims asserted by the spouse of a decedent who claimed a community property interest in Decedent’s company and Estate, with all claims dismissed and the Respondents’ being awarded their attorneys’ fees and costs
• Prevailed on a week-long bench trial invalidating a trust amendment for lack of capacity
• Obtained a court of appeal opinion affirming the trial court’s denial of an anti-SLAPP motion filed against a financial elder abuse cause of action for the improper procurement of a trust amendment
• Obtained the voluntary dismissal of a will contest on behalf of a US charity, resulting in all proceeds of the estate going to the charity
• Successfully defended heirs against fiduciary claims asserting $150 million in wrongful taking and elder abuse damages, ultimately resulting in a settlement with no liability to the heirs

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Successfully asserted claims on behalf of a surviving spouse and children against the spouse’s estate, resulting in a $40 million settlement

Obtained the removal of trustees improperly managing the assets of a valuable closely held business, ultimately resulting in the court-ordered sale of trust assets and distribution to the client

Successfully defended a US financial institution against allegations of financial elder abuse and intentional interference with an expected inheritance

Successfully defended an international financial institution against allegations of breach of fiduciary duty

Represented an heir to multibillion-dollar business in litigation proceedings pending in multiple states brought by individuals who sought ratification of elder financial abuse they committed and who sought to overturn the estate plan to their financial benefit. Successfully resolved with the estate plan being affirmed by the court and a confidential amount repaid by the abusers to the elder*

Obtained complete dismissal of a $10 million creditor’s claim made against an Estate by the decedent’s former business associates*

Successfully resolved a $40 million trust contest brought by the Decedents’ former children*

Obtained $4.9 million settlement representing widow against a former corporate trustee over its mismanagement and oversight of the sale of the trust’s primary asset, the widow’s marital residence and the trustee’s subsequent failure to distribute the sale proceeds*

Represented co-personal representatives in probate and trust proceedings pending in multiple states as contentious litigation took place between and among family members of the decedent over a multimillion-dollar estate and trust. Assisted the co-personal representatives in resolving the litigation and guiding the estate through complex issues arising from an Internal Revenue Service audit of the estate’s Form 706 Estate Tax Return*

Represented a US charity in resolving litigation over a charitable bequest, resulting in a multimillion-dollar settlement to the charity*

*Matter handled prior to joining the McDermott.

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• American College of Trust & Estate Counsel (ACTEC)
  • Fiduciary Litigation Committee, member
  • Amicus Brief Review Committee, member
  • Communications Committee, member
• American Bar Association, Real Property, Trust & Estate Law Section
  • Ethics & Malpractice Committee, Vice-Chair, 2014-2017; Chair, 2018; Co-Chair, 2020
  • Probate & Fiduciary Litigation Committee, co-chair
• California Lawyers Association
  • Trusts & Estates Executive Committee, 2018 – 2024
  • Trusts & Estates Quarterly, Editor-in-Chief, 2023

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Natallia advised:

• A Big 5 global tech company on a NIS2 compliance project, including monitoring implementation across all EEA member states, as well as on the Cyber Solidarity Act and the Critical Entities Directive*
• Major U.S. online media and cybersecurity software companies on the applicability of NIS2*
• A major global social media platform in a multijurisdictional cybersecurity compliance project*
• Several DAX40 companies on Cyber Resilience Act compliance strategy*

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Frédéric Chevallier focuses his practice on intellectual property matters, and in particular brings extensive experience leading on cross-border patent patent litigation before the Unified Patent Court (UPC) as well as before French courts. He represents pharmaceutical innovators and high-tech companies in their complex multi-jurisdictional patent disputes including matters involving small molecules, antibodies, Supplementary Protection Certificates (SPCs), medical use claims, and standard essential patents.

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• Representing a pharmaceutical innovator in the first ever enforcement campaign against several generic manufacturers before the Munich local division of the Unified Patent Court
• Representing online live gaming companies in revocation and infringement proceedings before the Paris central and Nordic-Baltic regional divisions*
• Representing a pharmaceutical innovator in the first ever cases in France on the enforcement of marketing exclusivity and regulatory data protection against generic manufacturers*

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• Managing IP, Patent Star, France, 2025-2026
• IAM Patent 1000, Silver, 2023
• WWL, Recommended National Leader France – Patents, 2023

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• AIPPL, Member
• EPLAW, Member
• LES, Member

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Jenny Lee is a results-driven litigator who focuses her complex commercial litigation practice on high-stakes securities, antitrust, and contract disputes. She brings deep trial experience and strategic insight to her representation of Fortune 500 companies and executives at trial, on appeal, and in arbitration.

Clients spanning industries such as healthcare, consumer products, retail, beverage, aviation, and real estate rely on Jenny’s clear risk assessments, courtroom skills, and ability to cut through complexity. She successfully manages trial teams, leads discovery strategy, and delivers favorable results in high-profile trademark and breach of contract disputes, securities class actions, shareholder derivative actions, and mergers and acquisitions litigation. As a trusted advisor to executive teams, in-house legal counsel, boards of directors, and investment professionals, Jenny guides major corporations through significant legal and operational challenges.

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• Achieved a unanimous jury verdict, which was affirmed in full by the US Court of Appeals for the Second Circuit, for a leading international beer, wine, and spirits producer after a two-week trial in a breach of contract and trademark infringement lawsuit in New York federal court*
• Achieved a favorable settlement for an e-commerce company and certain of its current and former directors in securities class action litigation in New York arising out of the company’s 2020 initial public offering*
• Defended a multinational pharmaceutical company in a putative class action litigation in New Jersey federal court alleging an anticompetitive reverse payment arising out of a patent litigation settlement concerning a cholesterol drug*

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Further examples of Omar’s work include:

• Advised on several complex international transactions including WE Soda/Sisecam, Connect Airways/Flybe, ResMed JV, Yandex/Uber JV, Rexnord/Regal Beloit, Expedia/Orbitz, Oracle/Peoplesoft, AOL/Time Warner, Vodafone/Mannesmann, and Guinness/Grand Metropolitan*
• Advised TFL/Lanxess, Tadano/Terex, Werner/Youngman, The Cooper Companies/Sauflon, Ticketmaster/Seatwave, and several other UK mergers before the UK Competition and Markets Authority*
• Advised several global corporations in major international antitrust and cartel investigations in the pharmaceutical, technology, electronic components, airline, steel, automotive, and maritime sectors*
• Acted for pharma company in relation to an ongoing investigation by the Competition and Markets Authority into alleged excessive pricing in the pharmaceuticals sector (winner of GCR Behavioural Matter of the Year – Europe)*
• Acted for UK pharma company in relation to a statement of objections by the Competition and Markets Authority in relation to an alleged pay-for-delay arrangement in the pharmaceuticals sector*

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• Ranked, Competition Law, Chambers UK (2025-2026)
• Ranked, Competition Law, UK, Chambers Europe (2025)
• Ranked, Competition Law, UK, Chambers Global (2013–2025)
• Recognized, Competition Law, London, The Best Lawyers in the United Kingdom (2020–2022)
• Recommended, Dispute Resolution: Competition Litigation, Legal 500 UK (2025-2026)
• Recommended, Industry Focus: Life Sciences and Healthcare, The Legal 500 UK (2024, 2025)

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Jerry L. Hall focuses his practice on restructuring, bankruptcy, and insolvency with a focus on distressed situations. He counsels clients on financial and operational restructurings across the United States, including Puerto Rico.

Jerry guides troubled companies, independent directors, indenture trustees, debtors-in-possession, committees, distressed debt investors, secured lenders, and lessors in mapping new and transformative paths. He regularly represents clients from a variety of industries, such as agriculture, aerospace and aviation, entertainment, finance, gaming and hospitality, life sciences, manufacturing, real estate, retail, and telecommunications.

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• Counseled a mortgage loan originator in connection with the ResCap RMBS litigation*
• Counseled a pork processing enterprise debtor in its chapter 11 case*
• Counseled the debtor of a specialty airline offering business class only service to London in its chapter 11 case*
• Counseled the debtor of a major online advertising company in its chapter 11 case, which involved three separate sales of assets*
• Represented a mezzanine lender in its chapter 11 case involving multi-debtor real estate developers, which included related substantive consolidation and intercreditor litigation*
• Counseled the Official Committee of Unsecured Creditors of a skin, hair, and oral care products seller, achieving significant recovery for unsecured creditors in a chapter 11 case despite the secured creditors being substantially undersecured*

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Daniel Weston focuses his practice on advising private equity sponsors, management teams corporates and other investors on a range of acquisitions, investments, joint ventures, disposals and restructurings.

He is highly experienced in guiding clients through complex, cross-border transactions, as well “buy-and-build” strategies and other portfolio matters, spanning the lifecycle of an investment. He has particular expertise of operating within the professional services, healthcare and leisure sectors.

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Examples of Daniel’s work includes:

• The shareholders of Dains Accountants on their exit to IK Partners, together with management’s reinvestment into the newco structure.*
• Horizon Capital on a number of high-profile leveraged buyouts of and exits from a range of UK, US and European-based companies, including Sapphire Systems, Ridge & Partners, BP3 and Turnmill.*
• Phoenix Equity Partners on their leveraged buyouts of 4most and Spy Alarms.*
• Spire Healthcare on a number of transactions, including its acquisitions of The Claremont Hospital, The Doctors Clinic Group and Vita Health.*
• Bridges Fund Management on its management buyout and subsequent exit from AgilityEco, through its “Evergreen” impact-focused equity fund.*

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Craig Garvey has extensive experience providing counsel to publicly traded companies and leading various capital markets transactions for public and private companies, including the portfolio companies of prominent private equity funds. He also has significant experience with initial public offerings (IPOs), secondary offerings, high yield and investment grade debt offerings, liability management transactions, transactions involving special purpose acquisition companies (SPACs), restructurings and bankruptcies, and tender and exchange offers.

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Equity offerings

• Represented an investor in connection with a $400 million perpetual convertible preferred PIPE investment in an NYSE listed industrial company
• Represented Ryan Specialty a provider of specialty products for insurance brokers, agents, and carriers, in its $1.6 billion Up-C IPO (NYSE)*
• Represented InnovAge Holding Corp.; Apax Partners; and Welsh, Carson, Anderson & Stowe (WCAS) in connection with InnovAge’s $400 million IPO (NASDAQ)*
• Represented TerraForm Global, Roundy’s Supermarkets, VWR, Civitas Solutions, Yankee Candle, and several other companies and underwriting syndicates in connection with proposed IPO processes*
• Represented GTCR in its $2.4 billion “take-public” sale of Cision to a SPAC and assisted with Cision’s subsequent listing on the NYSE*

Debt offerings

• Represented Constellation Brands, Inc. (NYSE: STZ) in connection with its offering of $500 million of its 4.850% Senior Notes due 2031
• Represented Ryan Specialty in connection with several senior secured notes offerings representing more than a billion dollars in proceeds*
• Represented Genuine Parts Company in connection with its first $500 million registered notes offering*
• Represented Six Flags Entertainment Corporation in connection with its $300 million, $800 million, and $1.2 billion 144A/Regulation S senior notes offerings*
• Represented Solera in connection with several high yield notes offerings representing more than a billion dollars in proceeds*
• Represented Navistar with multiple bond offerings, including its $1.1 billion high yield notes offering to effect a global balance sheet restructuring*

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