Here is a biographical summary of Ján Klučka (also written Ján Klučka) based on available sources:

Basic Information

• Ján Klučka was born in 1951. (Curia)

• He is from Slovakia. (ResearchGate)

Education and Academic Career

• He obtained a Doctor of Law degree from the University of Bratislava in 1974. (Curia)

• Since 1975, he has been a Professor of International Law at the Pavol Jozef Šafárik University in Košice, Slovakia. (Curia)

Other Professional Roles and Memberships

• He served as a Judge at the Constitutional Court of Slovakia in 1993. (Curia)

• He is a member of the Permanent Court of Arbitration at The Hague. (Curia)

• He has been involved with the Venice Commission (a Council of Europe advisory body). (Curia)

Publications / Research Focus

• He is the author of Regionalism in International Law (2018, published by Routledge). (National Library of Australia Catalogue)

• He has published work on EU administrative law, such as The General Trends of EU Administrative Law. (SMU Scholar)

• His research interests include regionalism in international law, institutions of international organizations, and inter-regional law. (SciSpace)

If you like, I can prepare a more detailed biography (education timeline, major works, influence, etc.).