Nathan Castellano advises clients on all aspects of doing business with and litigating against the federal government. His experience includes: bid protests, contract disputes, False Claims Act litigation, FOIA, Foreign Military Sales, Buy American & Trade Agreement Acts, suspension and debarment, general contract and grant compliance, audits, teaming agreements, subcontracting, small business issues, cost accounting, data rights and intellectual property, and fiscal law.

Mr. Castellano studied procurement law extensively at the George Washington University Law School, working as a research assistant to Professor Steven Schooner and graduating as a Murray Schooner Procurement Scholar. Prior to joining the firm, he clerked for the Honorable Jimmie V. Reyna at the United States Court of Appeals for the Federal Circuit and worked as a legal consultant in the World Bank Office of Suspension and Debarment (OSD). He is a widely published author, with articles cited in leading treatises and used as course material.


'Other Transactions' Are Government Contracts, And Why It Matters (pdf)
ABA's Public Contract Law Journal, Vol. 48, No. 3
Federal Circuit Decides Two CDA Jurisdiction Cases in Contractors' Favor and Provides Guidance on Maropakis
2 Sensible Resolutions to CDA Jurisdictional Challenges
Aerospace & Defense Law360, Appellate Law360, Government Contracts Law360
The Supreme Court Reshapes FOIA Exemption 4 (pdf)
The Government Contractor, Vol. 61, No. 27
Fed. Circ. Limits Gov't Contractors' Litigation Cost Claims
Appellate Law360, Construction Law360, Employment Law360, Energy Law360, Government Contracts Law360


  • JD, George Washington University Law School, 2015, highest honors, Order of the Coif
  • BA, Roanoke College, 2012, magna cum laude
  • District of Columbia
  • US Court of Federal Claims
  • US Court of Appeals for the Federal Circuit
  • United States Court of Appeals, Federal Circuit, The Honorable Jimmie V. Reyna
  • Adjunct Professor, The George Washington University Law School

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