Professor Siemion works as the Director for National Security Advocacy for Human Rights First where she is an expert on issues at the intersection of human rights and national security and the intersecting legal frameworks that govern counterterrorism operations at home and abroad, including the law of armed conflict, international human rights law, and sovereignty laws. She leads the organization’s effort to ensure that US national security policies respect human rights. She is also an editor at Just Security, an online forum for the rigorous analysis of U.S. national security law and policy.

Professor Siemion previously was an Associate Adjunct Professor of Law at American University Washington College of Law where she teaches a course on national security and human rights law that covers targeted killing, surveillance, and espionage. Before joining Human Rights First, she worked on a range of national security issues as Senior Counsel at The Constitution Project, including surveillance, privacy, and constitutional rights in the digital age. Previously, she spent several years in private practice litigation human and civil rights matters. She holds an LL.M. in National Security Law, with a certificate in International Human Rights Law, from the Georgetown University Law Center, where she graduated with distinction and was a peer review editor for the Journal of National Security Law & Policy. She received her J.D., with honors, from the George Washington University School of Law, where she has also taught as an Adjunct Professor of Legal Research & Writing. She has a B.A. in English, with a minor in Philosophy, from Seattle University, where she graduated from the Honors Program.