Nathaniel E. Castellano

When facing the most challenging and significant issues of government contracts law, even experienced procurement lawyers turn to Nathan Castellano for his insights, guidance, and perspective. He is a widely recognized thought leader in the government contracts community and a seasoned advocate with experience navigating a broad range of high-profile procurement disputes, transactions, and investigations.

Nathan is a co-author of the classic text Formation of Government Contracts (5th Edition), and he is a “Contributing Author” to The Nash & Cibinic Report. Nathan’s publications are cited in judicial opinions, administrative decisions, and leading treatises.

Nathan previously clerked for the Honorable Jimmie V. Reyna at the United States Court of Appeals for the Federal Circuit and studied procurement law at the George Washington University Law School, graduating as a Murray Schooner Procurement Scholar. His accolades include recognition by Chambers USA as “Up and Coming” in Government Contracts (2025) and by Law360 as a "Rising Star" in Government Contracts (2023).