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.


What To Expect From OTA Protests And Disputes
Aerospace & Defense Law360, Government Contracts Law360
Fed. Circ. Clarifies Infringement Liability For Contractors
Aerospace & Defense Law360, Appellate Law360, Government Contracts Law360, Intellectual Property Law Law360
Other Transactions Authority (OTA): Protests and Disputes
GAO Will Police 'Other Transaction Authority' Awards
Aerospace & Defense Law360, Government Contracts Law360, Technology Law360
GAO Sustains Oracle's Other Transaction Authority (OTA) Protest


  • 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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