Prof. Konstantinos Tsimaras is the President of the Hellenic Regulatory Authority for Energy, Waste and Water (RAAEY), a position he has held since 2020, providing strategic leadership, regulatory oversight, and international representation for the Authority. In this role, he represents Greece in major European and international regulatory fora, including ACER, CEER, MEDREG, ERRA, ECRB, EMGF, the Balkan Energy School, and RegulaE.Fr. He also serves as Vice‑President of WAREG and MEDREG, contributing to coordinated regulatory approaches and policy development across Europe and the Mediterranean. His responsibilities include the supervision of EU policy monitoring, cross‑border regulatory cooperation, and bilateral institutional engagement in the fields of energy and water. Prof. Tsimaras has been an academic since 2002, serving as Professor of Public Law with teaching and research activities in constitutional and administrative law, energy and environmental law, EU public economic law, and broader fields of public law. His academic work is complemented by extensive public‑sector advisory experience. He has served as Legal Adviser to the Ministry of Interior and Public Administration (2004–2009), the Ministry of Tourism (2012–2015), providing high‑level expertise in constitutional, administrative, and public international law.