Los Angeles
Brian Casillas focuses his practice on all aspects of employment litigation and counseling. He has experience in California and federal civil procedure including discovery, motion practice, defending depositions and negotiating settlements. He represents clients against claims under the Fair Employment & Housing Act, Labor Code, Cal/OSHA and Americans with Disabilities Act. Brian also advises corporate clients and individuals across various industries including technology, manufacturing, real estate and construction.
- Second-chaired employment law trial, achieving defense verdict on claims for misclassification, failure to provide meal and rest breaks; drafted jury instructions, argued motions in limine and cross-examined Plaintiff’s expert*
- Represented national aerospace manufacturer in PAGA declaratory relief arbitration, achieving defense award on claims for failure to provide meal periods and rest breaks, and overtime pay*
*Matter handled prior to joining the firm.
- Best Lawyers: Ones to Watch in America, Labor and Employment Law – Management (2023-2026), Litigation – Labor and Employment, 2026
- Hispanic National Bar Association, deputy general counsel
- GRYD Foundation, board of directors
- Loyola Law School, JD
- University of California, Los Angeles, BA
- California
- English
- Spanish
Kelly Shami
Miami
Kelly Shami is an experienced litigator who has represented clients in a wide array of complex commercial disputes and white-collar disputes across many different subject matters. She has worked with her clients to develop and execute effective trial strategies in mass tort and product liability cases based on the organization’s goals and has secured defense verdicts in high-stakes, multi-week jury trials. She has also achieved favorable results for clients in post-acquisition and restrictive covenant disputes. Kelly’s practice extends to white-collar defense, conducting internal healthcare and regulatory investigations, and negotiating with government agencies on compliance matters, including alleged violations of the False Claims Act.
- Best Lawyers: Ones to Watch, Commercial Litigation and Criminal Defense: White-Collar, 2024-2025
- Florida State University, MBA
- University of Miami School of Law, JD, magna cum laude
- Southern Methodist University, BA
- 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
- French
- Arabic
Jonathan D. Salm
New York – One Vanderbilt Avenue
Jonathan D. Salm supports large and small healthcare transactions, including mergers, acquisitions and joint ventures. He has experience managing deals across a number of healthcare sectors, including primary care, pediatric, non-profit, nursing home, orthopedic, ophthalmology and other types of medical groups, which provides him with valuable insights into the nuances of client needs within each space. Jonathan also has experience handling due diligence reviews and assisting clients on both the buy-side and sell-side address regulatory concerns that could impact their transactions.
While in law school, Jonathan served as an associate editor for the Hofstra Law Review.
- Best Lawyers: Ones to Watch in America, Healthcare Law (2022-2026), Mergers and Acquisitions Law, 2026
- Maurice A. Deane School of Law at Hofstra University, JD
- Frank G. Zarb School of Business at Hofstra University, MBA
- University of Michigan, BS
- Florida
- New Jersey
- New York
Ariel Beverly
Los Angeles
Ariel Beverly is an employment advisor and litigator. Her practice focuses on complex litigation, as well as providing employers with practical and legal guidance as they confront dynamic workplace issues.
- Loyola Law School, JD, cum laude, Order of the Coif
- University of California, Berkeley, BA, Highest Distinction
- California
- US District Court for the Central District of California
Kevin Cummings
London – 22 Bishopsgate
Kevin Cummings is the partner-in-charge of the Firm’s UK Tax Practice.
Kevin is a senior, solutions-driven tax practitioner, having served as a tax partner from within both the legal sector and the Big Four – a hybrid background that enables Kevin to draw upon the strengths of both professions in delivering client advice.
- Advised US groups on European and UK inbound investment.
- Advised UK and US groups on international expansion and group structuring.
- Advised multinationals on efficient group structuring, profit repatriation and tax-free reorganizations, including in relation to permanent establishment taxation arising from computer servers and new, post-pandemic working patterns.
- Legal 500 UK, Recommended, 2023-2025
- Chambers UK, Tax, 2023-2025
- Alternative Investment Management Tax Committee
- Alternative Credit Council Tax Committee
- HMRC and HM Treasury Working Groups, including on debt and derivative taxation reform, cryptoasset taxation, securitization and fund management
- College of Law, JD
- University of Cambridge, LLM
- Utrecht University
- England and Wales
- English
- French
- German
Dr. Christian Marzlin
Frankfurt
Dr. Christian Marzlin represents German and international clients in domestic and cross-border M&A transactions.
Christian has wide experience in the fields of private equity, venture capital as well as strategic investments. Moreover, he regularly advises clients on complex strategic joint-ventures, reorganizations and general corporate law.
Christian has worked across a range of investment sectors including media & technology, healthcare, banking & finance, industrials and consumer goods.
Prior to joining McDermott Will & Schulte, Christian worked in the corporate and M&A department of a major international law firm in Frankfurt am Main.
Christian advised:
- Süd BG on the sale of its shares in KKL Group to Triton portfolio company bluu unit
- myneva Group, a portfolio company of Summa Equity, on the acquisition of Kuidado GmbH
- Investcorp on the sale of Contentserv to Centric Software
- Handelsblatt/Best Lawyers™, “Ones to Watch” in Germany: Corporate Law and Mergers and Acquisitions Law, 2023-2025
- Corporate Law Association (VGR)
- German-American Lawyers’ Association
- Hanseatic Higher Regional Court, Second State Exam
- Rheinische Friedrich-Wilhelms-Universität Bonn, Dr. jur. (PhD)
- Rheinische Friedrich-Wilhelms-Universität Bonn, First State Exam
- Germany
- German
- English
Princess Fuller
Atlanta
New York – One Vanderbilt Avenue
Princess Fuller focuses her practice on both mergers & acquisitions and private equity transactions across a variety of industries. Princess also advises on energy and infrastructure matters including representing clients on the development, structuring and negotiation of complex project financing transactions and negotiating credit, security and purchase agreements on behalf of sponsors, developers and lenders.
- Represented a solar and storage developer in connection with tax equity investments in its distributed generation portfolios of commercial-scale and community solar projects being developed throughout the United States
- Advised an investment fund in its sale of a healthcare lending platform for approximately $100 million
- Advised the Clermont Group on its investment into Post Era, Inc.
- Best Lawyers: Ones to Watch in America, Energy Law, Mergers and Acquisitions Law, Project Finance Law, 2026
- National Black Lawyers, Top 40 Under 40 (New York), 2019 to 2023
- Super Lawyers, Rising Stars 2024 – Top rated Mergers & Acquisitions attorney in New York, New York
- New York City Bar, African Affairs Committee, board member
- Georgetown University Law Center, JD
- Georgetown University, BS
- Georgia
- New York
- English
- Spanish
Charlie Seidell
Washington, DC
Charlie Seidell focuses on high-stakes statutory, constitutional, and administrative law matters in federal and state courts, having briefed dozens of complex appellate matters, including certiorari-stage and merits cases before the US Supreme Court. His experience includes drafting cert petitions, briefs in opposition, amicus briefs, and merits briefs, as well as arguing appeals before the US Courts of Appeals for the Fourth and Seventh Circuits.
Charlie’s practice includes dispositive motion work at the trial-court level, with a particular emphasis on litigation under the Administrative Procedure Act (APA) and the Freedom of Information Act (FOIA). He has helped clients successfully challenge unlawful state and federal regulations and develop coordinated litigation and public records strategies to advance broader advocacy objectives. Charlie has represented clients in administrative and appellate matters across a range of industries.
Charlie serves as co-director of Yale Law School’s Supreme Court Advocacy Clinic, where he teaches Supreme Court practice and supervises pro bono litigation before the Court. Prior to joining McDermott Will & Schulte, he clerked for the Honorable Diana Gribbon Motz of the US Court of Appeals for the Fourth Circuit. While in law school, Charlie interned with the US Attorney’s Office for the Southern District of New York, Civil Division, and served as an articles editor of the Yale Law Journal.
- Working with a team of students in the Yale Supreme Court Advocacy Clinic, won a merits Supreme Court case expanding federal court jurisdiction over agency decisions.
- Won a merits Supreme Court case expanding the availability of First Step Act relief to incarcerated defendants.
- Successfully defeated a petition for a writ of certiorari in the US Supreme Court to defend an arbitral award of more than $50 million.
- Argued and won a qualified immunity appeal in the Fourth Circuit for a victim of excessive force.
- Won a Seventh Circuit appeal based on novel legal arguments to successfully overturn jury verdict in FLSA case and expand protections for employers.
- Won affirmance of dismissal of significant ERISA claims in the Second and Seventh Circuits.
- In a major ANDA appeal in the Federal Circuit, obtained reversal of a district court’s sua sponte invalidation of certain patent claims
- Prevailed in a significant Federal Circuit patent appeal to obtain affirmance of summary judgment in favor of a client.
- Won an appeal from FDA’s denial of a new drug application, successfully overturning the agency’s grant of summary judgment and resulting in the first drug approval hearing in decades.
- Prevailed in Fourth Circuit appeal to successfully invalidate portions of an unlawful state tax.
- Prevailed in an APA challenge in the US District Court for the District of Columbia to successfully overturn agency limitations on the use of 340B drugs.
- Won a significant FOIA case in the US District Court for the District of Columbia to obtain critical records for a client and restrict agency invocations of the deliberative process privilege.
- Assisted clients with safeguarding sensitive records in response to state public records requests.
- District of Columbia Courts, Capital Pro Bono Honor Roll, 2023
- Yale Law School, JD
- Johns Hopkins University, BS
- District of Columbia
- US Court of Appeals for the Fourth Circuit
- US District Court – District of Maryland
Daniel T. Menken
Wilmington
Daniel (Dan) T. Menken focuses his practice on corporate and commercial litigation matters involving mergers and acquisitions, fiduciary duties, corporate governance and control, commercial contracts, advancement and indemnification, appraisals, and books and records demands. He has experience representing clients’ interests before the Delaware Court of Chancery, the Delaware Superior Court Complex Commercial Litigation Division, the Delaware Supreme Court, and the US District Court for the District of Delaware.
- Represented a US health insurance provider in its successful application for a preliminary injunction enjoining its counterparty’s termination of a multi-billion dollar merger transaction, as well as in the post-termination damages trial and successful appeal upholding the trial court’s damages decision*
- Represented subsidiaries of a major Canadian pension fund in their successful application for a TRO enjoining their co-investor’s sale of its ownership interest in a Texas utility company, as well as in the expedited trial and successful expedited appeal reversing the trial court’s decision*
- Represented a multi-billion dollar asset management firm in expedited stockholder class action litigation challenging a merger transaction, resulting in a post-trial opinion one month after the litigation was filed*
- Wake Forest University School of Law, JD
- Colgate University, BA
- Delaware
- US District Court for the District of Delaware
Brigid McCarthy
Chicago
Brigid McCarthy focuses her practice on white-collar and securities defense matters, including the defense of criminal and civil investigations brought by the Department of Justice (DOJ), the Securities and Exchange Commission (SEC) and State Attorneys General. Brigid has substantial experience conducting internal investigations in response to both government and other regulatory subpoenas. She represents and counsels clients in matters involving the False Claims Act, federal securities and healthcare law, and the Foreign Corrupt Practices Act, among other areas including commercial disputes. She also advises clients on and manages responses to civil investigative demands and government subpoenas.
- Civil Litigation and White-Collar Defense
- Representing Investment Management company in SEC investigation concerning misleading investors
- Representing Fortune 500 company in a securities class action concerning auto insurance
- Representing former senior management in shareholder derivative and shareholder class litigation related alleged breach of fiduciary duties
- Representing Fortune 500 in an SEC investigation relating to purported accounting issues
- Representing healthcare company in confidential internal investigation concerning third-party billing practices
- Internal investigation about non-profit foreign partnership to consider potential agency and FCPA violations
- Best Lawyers: Ones to Watch in America, Criminal Defense: White-Collar, 2025-2026
- Northwestern Pritzker School of Law, JD
- University of Iowa, BA
- Illinois
- US District Court for the Northern District of Illinois
- US District Court for the Northern District of Illinois
- English
- Spanish
