Lénárd Sándor is the head of the Center for International Law at the Mathias Corvinus Collegium, and a Research Fellow at the Eötvös József Research Centre at the National University of Public Service. He is a graduate of Pázmány Péter Catholic University (Budapest, Hungary), where he received his J.D. (summa cum laude) in law and political sciences as well as of Canisius College (Buffalo, New York, U.S.A.) where he received his M.B.A. in international economics and global supply chain management. During his university studies, he was awarded the Fellowship granted by the Hungarian Republic. Subsequently, he took the Hungarian bar exam and received his Ph.D. in law and political sciences in the field of international public law. His doctoral studies focused on economic globalization and explored the impacts of business corporations and especially transnational and platform-based businesses on international human rights law. He was a visiting researcher at the Aarhus University (Denmark), at the Osgoode Hall Law School in Toronto (Canada) and at the Federal Judicial Center in Washington, D.C. (U.S.A.). He defended his Ph.D. thesis with summa cum laude from the Doctoral School of Law and Political Sciences of the Pázmány Péter Catholic University.

In the legal practice, from 2006 to 2011 he served at the Office of the Attorney General in Budapest and from 2011 to 2020 he was a chief counsel at the Constitutional Court of Hungary. From 2020 to 2022 he was working as a policy advisor at the European Parliament in Brussels where his focus was on constitutional affairs of the European integration. He has previously taught various fields of international public law including the law of international economic relations and international human rights law at Pázmány Péter Catholic University. He has published numerous articles on contemporary international legal and constitutional questions in various academic, intellectual and popular journals. His work on international economic and human rights law has been published, among others, by Edward Elgar Publishing and Central European Journal of Comparative Law. He is the author of Alkotmányjogi utazás Amerikában [Constitutional Journey in the United States] (MCC Press, 2021). He has translated, cotranslated and edited a number of books related to international law and politics or the United States of America including, among others, Joshua Muravchik, Földre szállt mennyország [Heaven on Earth] (2014), Amerikai konzervatív gondolkodók [American Conservative Thinkers] (2017), John Baylis and others, A világpolitika globalizációja [The Globalization of World Politics] (2020). He speaks English and French.

His primary research interests at the Mathias Corvinus Collegium include international economic law, the international legal approach to economic globalization along with the reform process of international investment law, international human rights law, the interpretative methods of international law with special emphasis on the dilemma of evolutionary interpretation as well as the interface of Christianity and international law.