Sean H. Donahue’s practice is focused on appellate litigation, including environmental cases in federal and state appellate courts, legal counseling, and helping clients communicate effectively to courts, agencies, and other audiences. He is a member of the bars of the District of Columbia and the State of California.

A 1992 graduate of University of Chicago Law School, Sean served as law clerk to Ruth Bader Ginsburg, then of the U.S. Court of Appeals for the D.C. Circuit, and to Justice John Paul Stevens. He entered private practice at Jenner & Block’s Washington office, where worked on civil matters including in telecommunications and First Amendment law. He then spent four years at the Department of Justice, Environmental and Natural Resources Division, Appellate Section, briefing and arguing cases in the United States Courts of Appeals, and state supreme courts concerning federal environmental and natural resources law, federal property law, takings, and Indian law.

Since first establishing his own practice in 2002, Sean has participated in several significant cases in the U.S. Supreme Court, including successfully briefing and arguing Environmental Defense v. Duke Energy Corp. for the petitioners, and serving as counsel of record for environmental and public health organization parties in major Clean Air Act cases in the Supreme Court’s 2013 and 2014 terms. Sean has argued more than 40 cases in various appellate courts, and his practice regularly includes representation of public interest organizations, governmental bodies, and and private entities in appellate courts throughout the country. In addition, Sean has taught courses in environmental law, civil procedure, constitutional law, climate change law and policy, and other subjects at Washington & Lee University School of Law, Iowa College of Law, and Georgetown University Law Center.


David T. Goldberg is a New York-based attorney whose practice is focused primarily on constitutional and public law litigation in the U.S. Supreme Court and in federal and state appellate courts. He is a member of the bars of New York and the District of Columbia.

A graduate of Harvard Law School, where he was Articles Co-Chair of the Law Review, David served as law clerk to Ruth Bader Ginsburg, then of the U.S. Court of Appeals for the D.C. Circuit, and to Justice David H. Souter. He then worked in the White House as special counsel in the Office of Presidential Personnel. From 1995 to 2000, David served on the staff of the NAACP Legal Defense Fund, Inc., where he litigated cases based in constitutional and statutory anti-discrimination law at both the trial and appellate level.

Since first establishing his own practice in 2000, David has been involved in more than 100 matters in the U.S. Supreme Court, representing a diverse array of clients, including state and local governments, labor unions, civil rights, public health, and environmental organizations, community groups, and members of the U.S. Senate. In 2006, he helped to establish the Supreme Court Litigation Clinic at the University of Virginia School of Law, where he holds the title of Lecturer in Law. In 2014, he was among the 75 lawyers recognized by Reuters as constituting the “elite” of the Supreme Court Bar, one of only a handful on that list with a public interest, rather than a business-focused, practice.

David has been involved in important civil rights and commercial cases in federal and state appellate courts around the country, and he is frequently sought out by other attorneys and firms to lend expertise on discrete legal issues and to advise on matters of appellate strategy and practice.

He resides in Brooklyn, New York, with his wife, audio producer Wesley Weissberg, and their two children.


Susannah Landes Weaver’s practice is focused on environmental appellate litigation in the federal and state appellate courts.  She is a member of the District of Columbia and Maryland bars.

A graduate of the Georgetown University Law Center, Susannah served as law clerk to Justice Stephen G. Breyer, Second Circuit Chief Judge Robert A. Katzmann, and Judge Henry H. Kennedy, Jr. of the District Court for the District of Columbia.  Prior to joining Donahue and Goldberg, Susannah was an attorney in Orrick, Herrington & Sutcliffe’s Supreme Court & Appellate Group.  There, she briefed over fifteen appeals in federal and state appellate courts in a wide range of areas, including environmental, patent, privacy, and constitutional litigation, primarily for major technology companies.  She also advised clients on Supreme Court strategy and drafted several petitions for certiorari.

Susannah’s interest in environmental law, policy, and science began when she was an undergraduate concentrating in ecology at Harvard University.  She began her career at the Boston Public Health Commission where she launched an initiative to reduce the City’s greenhouse gas footprint.  She then moved to Capitol Hill, as a professional staff member for the House of Representatives Committee on Science.  There, Susannah focused on environmental policy and law, organizing hearings on topics including particulate matter pollution, climate change, forest fires, and endangered species, and working to advance progressive (and halt regressive) environmental legislation.  During law school, Susannah assisted Professor Lisa Heinzerling draft the petition for certiorari and merits briefs in the successful Massachusetts v. EPA litigation in the Supreme Court.

Susannah resides in Washington, D.C. with her husband, Kenyon Weaver, and their two children.

Our Offices

Washington Office
1111 14th St., NW Suite 510A
Washington, DC 20005
202.277.7085 (Sean)
202.569.3818 (Susannah)

New York Office
99 Hudson Street, 8th Floor
New York, NY 10013
212.334.8813 (David)