Árpád Lapu is a policy adviser on constitutional issues at the European Parliament since 2019 and a PhD student of the Károli Gáspár University of the Reformed Church in Hungary. Between 2017-2019, he worked as an adviser at the Cabinet of the Minister of Justice of Hungary, conducting comparative constitutional analyses. He has earned his JD at the Pázmány Péter Catholic University in Hungary, has a BA in international relations from the University of Szeged, and an MA in European and international administration from Andrássy Gyula German Speaking University in Budapest. He has completed an Edx MicroMaster in cooperation with the Catholic University of Louvain (UCLouvain) in international law. His field of research is non-participation in armed conflicts, neutrality in international law, and constitutional norms regarding participation in armed conflicts. He has written publications regarding the future of the EU ETS system of the European Union, the institutional reform proposals of the Union, and has conducted research in the field of social sciences.

He has been a leading columnist of the Constitutional Discourse Blog since 2023.