Before joining Weil, Zack served for five years as an Assistant to the Solicitor General in the Office of the Solicitor General at the U.S. Department of Justice. In that role, he represented the United States in litigation in the Supreme Court, and assisted in coordinating the government’s appellate strategy in lower courts nationwide. 

Zack has also served as Special Counsel to the General Counsel of the U.S. Department of Defense and Attorney Adviser at the U.S. Department of State. At the Department of Defense, Zack advised the General Counsel on high-stakes legal issues facing the Department, including Supreme Court and appellate litigation matters. Zack also provided advice on the Department’s counterterrorism operations and information operations. In addition to arguing before the Supreme Court, Zack has argued in the U.S. Court of Appeals for the Eleventh Circuit and the Iran-U.S. Claims Tribunal in The Hague.

Representative U.S. Supreme Court Experience:

• Mission Product Holdings, Inc. v. Tempnology, LLC (bankruptcy and trademark)*
• WesternGeco LLC v. ION Geophysical Corp. (patent)*
• Life Technologies Corp. v. Promega Corp. (patent)*
• Apple v. Pepper (antitrust)
• Leidos v. Indiana Public Retirement System (securities)
• Coventry Health Care of Missouri, Inc. v. Nevils (insurance)*
• Kingdomware Technologies, Inc. v. United States (government contracting)*
• United States v. Texas (immigration)
• Rubin v. Islamic Republic of Iran (foreign sovereign immunity)*
• Ross v. Blake (administrative exhaustion)*
• Bullard v. Blue Hills Bank (bankruptcy)*
• Brown v. Plata (prison conditions)

Other Representative Appellate Experience:

• In re Urethane Antitrust Litigation (antitrust)
• Commisa v. Pemex-Exploración y Producción (enforcement of arbitral award)
• Republic of Argentina v. NML Capital (foreign sovereign immunity)
• Postal Service v. Postal Regulatory Commission (administrative law)
• Allergan v. United States (First Amendment)

Earlier, Zack served as a law clerk for Judge Amalya Lyle Kearse of the U.S. Court of Appeals for the Second Circuit, and for Justice Ruth Bader Ginsburg of the U.S. Supreme Court.

Zack received his B.A., cum laude, from Yale University in 1997. After working for several years as a software engineer, he then received his J.D. from Columbia Law School in 2005, where he was a James Kent scholar and served as an Articles Editor of the Columbia Law Review.

* Argued

(Representative experience includes matters handled prior to joining Weil.)