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 has published more than fifteen articles addressing various topics in procurement law.


GAO Will Police 'Other Transaction Authority' Awards
Aerospace & Defense Law360, Government Contracts Law360,Technology Law360
GAO Sustains Oracle's Other Transaction Authority (OTA) Protest
Pursuing Self-Interest While Achieving Oversight GAO Protest Reform Should Look to Process, Not Politics - Part 1 (pdf)
The Government Contracting Law Report, Vol. 4, No. 5
Fed. Circ. Implies Narrowing Of Claims Court Jurisdiction
Appellate Law360, Government Contracts Law360, Real Estate Law360, White Collar Law360
Fed. Circ. To Decide Future Of Commercial Item Contracting
Aerospace & Defense Law360, Appellate 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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