International law firm McDermott Will & Emery is pleased to announce that Mary Schnoor has joined as a partner in its Litigation Practice Group in Washington, DC. Mary brings substantial experience in government and regulatory litigation and appellate matters as a former Biden Administration official and Supreme Court law clerk. She joins from Covington & Burling.

“Mary’s deep understanding of administrative law and her extensive appellate experience will be invaluable to our clients facing complex litigation challenges,” said Steven Scholes, global head of McDermott’s Litigation Practice Group. “Her background in both government and private practice will greatly support our clients’ high-stakes appellate needs.”

Mary represents clients across various industries in developing and executing challenges to agency actions under the Administrative Procedure Act (APA) and other laws governing judicial review of government action. Her practice also includes advising and crafting arguments on statutory interpretation and constitutional issues. Mary previously served as deputy general counsel at the US Department of Homeland Security (DHS), where she oversaw the rulemaking process for all significant DHS rules, led the completion of high-profile regulatory actions, and advised on the diverse statutory and regulatory schemes administered by DHS and its agencies.

At the start of her legal career, Mary served as a law clerk to the late Justice Ruth Bader Ginsburg and to the Honorable Richard Posner of the US Court of Appeals for the Seventh Circuit.

“I’m thrilled to join McDermott and collaborate with such a talented team of litigators,” Mary said. “I look forward to leveraging my experience to help our clients, whether in navigating problems stemming from government action or in formulating winning legal arguments.”

McDermott’s team of more than 250 litigation and dispute resolution lawyers worldwide includes seasoned litigators, trial lawyers, mediators, arbitrators, appellate lawyers, and former senior US prosecutors. We represent clients across every business segment in high-impact cases, government investigations, and dispute resolution proceedings. Working seamlessly with colleagues spanning a variety of practice areas, our litigators take on emerging issues in virtually every industry (with a focus on healthcare, life sciences, accounting services, private equity, and technology) to help clients stay a step ahead of potential risks. When needed, we also develop effective and cost-efficient solutions to address complex commercial disputes, consumer and data breach class actions, international arbitrations, deal and ERISA litigation, and other business challenges. Our nationally recognized US Supreme Court and appellate practice has successfully handled hundreds of appeals and is named on The National Law Journal’s Appellate Hot List. Known for “superb lawyering combined with practical, hands-on effort” (Chambers), our team is recognized globally in Chambers, Legal 500, Best Law Firms, Global Investigations Review GIR 100, and Global Arbitration Review GAR 100.

McDermott Will & Emery partners with leaders around the world to fuel missions, knock down barriers, and shape markets. Our team works seamlessly across practices and industries to deliver highly effective solutions that propel success. More than 1,400 lawyers strong, we bring our personal passion and legal prowess to bear in every matter for our clients and the people they serve.