Biljana Kostadinov is a full professor with tenure and the head of the Department of Constitutional Law. Her main area of research is comparative constitutional law, especially the organization of government in developed democracies (France, Great Britain, Spain, Germany), direct democracy (Switzerland, USA, Italy) and constitutional adjudication in member states of the European Union and the USA. Her postgraduate thesis focused on Canadian asymmetric federalism. The topic of her doctoral thesis was “Position of the President of the Republic in the French Fifth Republic”.

She is the president of the Croatian Association for Constitutional Law, founder of the Croatian-Canadian Academic Society, and a member of the Croatian Academy of Legal Sciences. She is also a member of the French Association of Constitutional Law, Central European Association for Canadian Studies, International Council for Canada Studies, and American Political Sciences Association. She was a member of the editorial board of the Collection of Papers of the Faculty of Law in Zagreb and Croatian Public Administration: a Journal for Theory and Practice of Public Administration. She is also a member of the Association for Croatian Scholarship Holders of the French Government. She is a member of the Council of Experts of the European Network of International Association of Constitutional Law and a scientific advisor of the Constitutional Court of the Republic of Croatia. She published a number of papers in Croatian and foreign scientific books and journals, and she is an editor of a few international collections of papers and the author of the book “Contemporary French Parliamentarism (1958-2002)”. She is also the editor of the book “Comparative Constitutional Law: Division of Power”, published in 2022 within the project titled “Research of Contemporary Issues of Comparative Constitutional Law”, which she has led. The French Association of Constitutional Law presented her with an award for her contribution to the science of comparative constitutional law and scientific cooperation (AFDC, 23. 04. 2005., Agen, Francuska). She is an alumna of Scholarships of the French Government (Bourse du gouvernement français, Institut Charles de Gaulle et Université Panthéon–Sorbonne Paris I, Centre de recherches de droit constitutionnel, Paris, 1992-93, 1998) and Fulbright Scholarships (Institute of United States Studies, University of London (1999) and Fulbright, The U.S. Constitution: Origins, Evolution & Contemporary Issues, Lafayette College, Easton, SAD, Fulbright American Studies Institute (2002)).