Rob Marshall leads the cross-border executive compensation and benefits practice at McDermott. For over 25 years, he has advised public and private companies and their senior executives on executive compensation and equity plan issues on a global basis.
Rob has implemented cross-border compensation, benefits, employment, and HR programs in more than 140 countries. He regularly advises companies on the treatment of these programs in public and private corporate transactions ranging from mergers and acquisitions, spin-offs and divestitures, as well as the tax treatment of cross-border employees participating in these programs and integration issues post-closing.
Global Plans
- Advised Fortune 25 consumer goods multinational company on the implementation of stock option and RSU awards in 84 countries, which included tax, securities, exchange control, data privacy, and employment issues*
- Assisted biotech company with executive compensation matters including executive employment agreements and equity awards in 32 countries*
- Advised on the implementation of a ‘choice’ program in 44 countries where employees selected their mix of equity awards and cash compensation*
- Provided global equity plan implementation and on-going advice for LTIP and ESPP programs in 73 countries which included tax-qualified awards, regulatory and exchange controls*
- Provided US consumer good multinational with implementation of long-term cash and equity awards in 77 countries, including tax, securities, exchange control and employment issues*
- Legal 500 US, Recommended, 2025
- Thomson Reuters, Stand-out Lawyer – independently rated lawyers, 2026
- Pro Bono Recognition List of England and Wales, 2026
- Bay Area Lawyer Magazine, named one of the Bay Area’s “best lawyers”
- National Association of Stock Plan Professionals
- State Bar of California
- New York University, LLM, Taxation
- University of California, Davis School of Law, JD
- University of California, Davis, MBA
- University of California, Davis, BA, Economics
- England and Wales
- California
Audrey Pumariega
Audrey Pumariega represents clients in high-stakes commercial, healthcare, and employment litigation.
Her clients include financial institutions, technology and telecommunications companies, accounting firms, hospitals, physician groups, health insurers, and managed services organizations. She regularly appears in federal and state courts, arbitration tribunals, and administrative proceedings, including before the Florida Agency for Health Care Administration and the Florida Board of Medicine.
- Defended a major financial institution in high-stakes civil actions relating to one of the largest Ponzi schemes in the United States
- Defended a putative class action seeking to block a large health insurer’s reorganization and force a multibillion-dollar transfer to policyholders
- Obtained dismissal and prevailed on appeal for an international accounting firm in a lawsuit brought by the firm’s former CEO seeking attorneys’ fees following a criminal acquittal
- Super Lawyers, Rising Star in business litigation and health care litigation, 2013 – 2022
- Lawyers for Children America, John Edward Smith Child Advocacy Award
- University of Miami School of Law, JD, magna cum laude, Order of the Coif
- University of Southern California
- Florida
- US Court of Appeals for the Eleventh Circuit
- US District Court for the Southern District of Florida
- US District Court for the Middle District of Florida
- English
- Spanish

Stephen Pedersen
Stephen Pedersen focuses his practice on acquisition and other debt financing transactions. His clients include private equity sponsors, their portfolio companies and public and private companies. On behalf of owners, investors, purchasers, portfolio companies and other corporate borrowers, Stephen regularly structures, negotiates, drafts and documents a wide range of complex and routine domestic and international debt financing matters.
- Represented H.I.G. Capital in the structuring, negotiation, and documentation of the financing of its investment in Enseo, USADebusk, Highridge Medical, Skincure Oncology, and STS Aviation
- Represented TA Associates in a variety of transactions, including the structuring, negotiation and documentation of the financing of its leveraged buyout of Advantice Health, LLC and certain of its subsidiaries*
- Represented Charlesbank Capital Partners LLC in the recapitalization of Polyconcept North America, Inc and certain of its affiliates consisting of an $800 million broadly syndicated term loan facility and $200 million revolving facility*
- Represented Delos Capital in a variety of transactions, including its leverage buyout of Le Sueur Inc. and its recapitalization of United Flea Markets, LLC *
- Represented Trivest Partners in a variety of transactions, including its leveraged buyout of Quatrro Business Support Services, Inc. and its recapitalization of Jon-Don, Inc.*
- Best Lawyers: Ones to Watch in America, Banking and Finance Law, 2026-2027
- University of Pennsylvania Law School, JD
- University of Pennsylvania, Wharton School of Business, Certificate of Management
- Villanova University, BA, Philosophy, French and Francophone Studies, summa cum laude
- Florida
- New York

Axel Schulz
Axel Schulz focuses his practice on European competition law and has a wealth of experience in merger control, global cartel defence and general antitrust advice in sectors including energy, chemicals, agri-commodities, container shipping, ports, pigments, medical devices and pharmaceuticals.
Within the pharmaceutical sector, Axel demonstrates exceptional proficiency and industry insight. He has built a solid reputation assisting clients with competition law matters arising around loss of exclusivity; in addition, Axel has advised on distribution, co-marketing, licensing and various forms of vertical and horizontal cooperation agreements.
Axel is adept in orchestrating advice across numerous jurisdictions, providing clients with clear and comprehensive solutions. This global aspect of his practice equips him to guide both national and multinational companies through the most intricate challenges.
- Advised a leading energy company in the acquisition of a renewable energy company with a dozen merger control notifications worldwide*
- Advised a sovereign wealth fund on the acquisition of a global agri-commodity business with a dozen merger control notifications worldwide*
- Advised a leading container shipping company on the acquisition of a leading niche player, resulting in several global merger control notifications*
- Advised a global specialty chemical company on the acquisition of a competing business with merger control filings in 11 jurisdictions, including the EC and the FTC*
- Provided a leading global pharmaceutical company with antitrust advice in relation to its blockbuster product*
- Winning Author, Concurrences, Antitrust Writing Awards – Readers’ Choice, 2026 – “Cooperate, protect, and challenge: Responding to dawn raids conducted by EU competition authorities“
- Shortlisted Author, Concurrences, Antitrust Writing Awards – Readers’ Choice, 2026 – “European Commission Fines Teva €462.6 Million for Misusing Divisional patents and Disparaging Generic Competitors in the Copaxone Market”
- JUVE Handbook of Commercial Law Firms, Recommended, Antitrust Law, 2016-2026
- Global Competition Review, GCR 100, 2025
- Lexology, Client Choice Award, Competition in Belgium, 2024
- Legal 500 EMEA, Recommended, 2016-2026
- Handelsblatt Best Lawyers in Germany, Antitrust/Competition Law, 2021-2023
- Winning Author, Concurrences, Antitrust Writing Awards – Readers’ Choice, 2026 – “Legal professional privilege in EU competition law: A broader horizon“
- Shortlisted Author, Concurrences, Antitrust Writing Awards – Readers’ Choice, 2026 – “European Commission Fines Teva €462.6 Million for Misusing Divisional patents and Disparaging Generic Competitors in the Copaxone Market”
- College of Europe, Bruges, LL.M, European Law
- University of Konstanz, Law Degree, Diploma in French Law
- University of Lyon
- Brussels
- Munich
- English
- French
- German
- Italian

Jon Hawk
Represents multinational technology companies, providers of online platforms, and digital businesses in complex litigation and regulatory matters worldwide
Defends clients nationwide in class actions and a broad range of technology-focused disputes, including on issues of privacy rights, artificial intelligence, consumer protection, constitutional rights, content moderation, and online speech
Jon Hawk is an accomplished commercial litigator with global litigation experience in technology, internet, and online platform law. He regularly handles a broad range of matters, including putative class actions for technology clients in state and federal courts nationwide, and has deep experience handling disputes and regulatory matters for them in every major region worldwide. Jon understands technology clients and is uniquely adept at handling issues that matter to them from his domestic and international representations.
- Obtained summary judgment on behalf of a mobile ad-serving and monetization platform in a dispute regarding a multiyear mobile ad fraud scheme perpetrated by a syndicate of foreign-based companies
- Obtained summary judgment on behalf of a mobile messaging service and smartphone application provider in defense of a putative nationwide class action filed on behalf of individuals alleging they received unsolicited text messages in violation of the Telephone Consumer Protection Act (TCPA)*
- Successfully represented an online platform in putative consumer class actions alleging claims under federal and state wiretap laws, obtaining early voluntary dismissal on an individual basis after filing motions to dismiss for lack of jurisdiction and failure to state claims
- University of California College of the Law, San Francisco, JD
- University of Richmond, BA
- California
- Supreme Court of the United States
- US Court of Appeals for the Fourth Circuit
- US Court of Appeals for the Fifth Circuit
- US Court of Appeals for the Ninth Circuit
- US District Court for the Central District of California
- US District Court for the Northern District of California
- US District Court for the Southern District of California
- US District Court for the Eastern District of California

Dr. Thomas Diekmann
Dr. Thomas Diekmann advises financial sponsors on domestic and cross-border M&A transactions in various industries. His expertise includes a wide array of private equity transactions, including leveraged buyouts, carve-outs, joint ventures, consortium arrangements, minority investments, and disposals.
Prior to joining McDermott Will & Schulte, Thomas worked in the private equity practice groups of other international law firms.
Thomas advised:
- Main Capital Partners on the acquisition of a majority stake in Raynet
- LLCP-backed cleversoft group on its acquisition of FS Assist
- Ardian on the acquisition of a majority stake in centrotherm international AG
- Handelsblatt/Best Lawyers™, “Ones to Watch” in Germany: Private Equity, 2023-2027
- Ludwig Maximilian University of Munich, Dr. jur.
- Higher Regional Court of Hamm, Second State Exam
- University of Münster, First State Exam
- Germany
- German
- English

Dr. Matthias Weissinger
Matthias Weissinger advises on domestic and cross-border financings as well as restructuring. His extensive experience provides valuable advice to national and international financial institutions, debt funds, sponsors, and corporate borrowers. Matthias’s expertise covers a wide range of areas, including leveraged buyouts, unitranche financings, bank/bond financings, and corporate lending for large and mid-cap companies.
In addition to his financing work, he has a strong background in complex debt restructurings, out-of-court solutions, insolvency proceedings, and distressed M&A transactions.
Matthias regularly publishes and lectures on insolvency and restructuring issues and acquisition finance.
Prior to joining McDermott Will & Schulte, Matthias was a partner at several leading international law firms.
Matthias advised:
- Main Capital Partners on the acquisition of a majority stake in Raynet
- InfraVia Capital Partners on the financing of the acquisition of a majority stake in Nexis Group GmbH
- Ardian on the acquisition of a majority stake in Pflegia
- JUVE Handbook of Commercial Law Firms, ‘Rising Star’: Loans and Acquisition Finance, 2025–2026
- Handelsblatt/Best Lawyers™, Germany: Banking and Finance Law, 2024-2027
- Chambers Europe, Band 4 in Germany: Banking & Finance, 2026
- University of Bayreuth, Dr. Jur.
- University of Pennsylvania, LLM.
- Ludwig-Maximilians-Universität München, First State Examination
- Germany
- English
- German

Asseret Frausto
Asseret Frausto focuses her practice on high-stakes commercial litigation as well as government and internal investigations. Her work spans a broad range of litigation matters at the trial and appellate levels in federal and state courts across the country, including class actions and other complex matters. She also frequently represents clients in both civil and criminal investigations under the False Claims Act (FCA), Anti-Kickback Statute (AKS) and the Eliminating Kickbacks Recovery Act (EKRA), conducted by federal government agencies and state attorneys general.
- Victims Rights Law Center, Shining Star, 2026
- Boston Bar Association, Mary K. Ryan Achievement in Pro Bono, 2025
- New England Legal Awards, Social Impact finalist, 2025
- Victims Rights Law Center, Champion Award, 2025
- Harvard Law School, Spanish for Lawyers Lecturer on Law
- Harvard Law School, JD
- University of California, Los Angeles, BA
- Massachusetts
- California
- US District Court for the Central District of California
- US District Court for the Eastern District of California
- US District Court for the District of Massachusetts
- US Court of Appeals for the Ninth Circuit
- US Court of Appeals for the Third Circuit
- English
- Spanish

Shawn O’Brien
Shawn O’Brien is nationally recognized by his peers and clients as a leading tax practitioner with a focus on tax litigation and controversies involving state, federal and international tax authorities. Drawing on his 25 years of experience, Shawn represents clients in tax examinations and administrative appeals and, when necessary, serves as a forceful advocate in litigation before the US Tax Court, US district courts, the US Court of Federal Claims, state courts and federal appellate courts. Shawn is the managing partner for the firm’s Houston office.
Clients interviewed in the Chambers USA Legal Guide 2024 shared that Shawn is “a trusted adviser and his level of service is superb” and he “has been a good strategic tax partner for our company,” particularly noting his “in-depth knowledge of our industry.”
- Represent Apache Corporation, a publicly traded oil and gas exploration and production company, in the Tax Court in tax disputes involving carrybacks of specified liability losses and research and development credits (Apache Corporation v. Commissioner)
- Represents Trail King Industries, a leading manufacturer of trailers, in the US District Court for the District of South Dakota in tax disputes involving a refund of federal excise taxes on heavy trucks and trailers (Trail King Industries, Inc. v. United States)
- Represents Apache Corporation, a publicly traded oil and gas exploration and production company, in the US District Court for the Southern District of Texas in tax disputes involving refunds related to a capital loss carryback and research and development credits (Apache Corporation v. United States)
- Represents a publicly traded waste collection company before the IRS Independent Office of Appeals and in preparation for litigation related to the federal motor fuels excise tax
- Chambers USA, Tax: Litigation, 2015–2026; Band 2, 2024–2026
- Legal 500 US, Recommended, 2024–2025
- Best Lawyers in America, Tax Law, (2023-2027), Litigation and Controversy – Tax, 2023-2027
- International Tax Review, 2013–2023 and 2026
- Internal Revenue Service Advisory Council (IRSAC), past chair of the Large Business & International subcommittee, 2016–2018
- State Bar of Texas Tax Section, past chair of the Energy and Natural Resources Committee, 2011–2013
- New York University School of Law, LLM
- Loyola Law School, JD
- Millsaps College, BBA
- Texas
- Louisiana
- US District Court for the Southern District of Texas
- US Court of Federal Claims
- US Tax Court

Kasim Reed
Kasim Reed is a seasoned litigator, business advisor and public servant who served two terms as the 59th mayor of the city of Atlanta. His practice focuses on complex commercial litigation, and he leverages his public policy experience for the strategic benefit of major corporations across a variety of industries.
- The Root, Top 10 Most Influential African Americans
- National Forum for Black Public Administrators, Distinguished Leadership Award
- Joint Center for Political and Economic Studies, Louis E. Martin Great American Award
- Howard University, trustee emeriti
- US Conference of Mayors, Transportation and Communications Committee, former chairman
- Atlanta Regional Commission, Regional Transit Committee, former chairman
- Howard University School of Law, JD
- Howard University, BA
- Georgia
