Leonidas Koskos is an attorney-at-law, member of the Athens Bar Association. He has served as the Executive Vice President, Deputy Chairman and President of various Greek industries.
He was the Chairman and Governor of National Welfare Organization, Chairman, President of the Confederation of Greek food Industries, President of the CIAA (the Confederation of Agro-food Industries of the European Union) in Brussels and member of Board of Directors of Hellenic Federation of Enterprises. He co-founded the National Council for Free Enterprise Greece where he served as Secretary General and President. He has instructed Philosophy of Law and Jurisprudence at the University of Athens Law School and gave lectures at the Economic University of Athens, at Chambers of Commerce and at conferences in Greece and abroad. He has served as Executive Director of the Hellenic American Union and Executive vice President of the Hellenic American University. He has been President of the Hellenic American University since 2012.