The European Union concentrates on the three main areas of European integration that mark the career path of Alfred E. Kellermann. Part I covers institutional and constitutional aspects, Part II general principles and substantive aspects and Part III new Member States and Eastern Europe. The contributions included in this Liber Amicorum vary from thematic in-depth studies to studies of a comparative nature. Their themes include, inter alia, the structure of the Union according to the Constitution for Europe, the changes and challenges with which the Union's institutions are faced, the future paths of flexibility (enhanced cooperation, partial agreements and pioneer groups), the role of national competition authorities and national courts under Regulation 1/2003, the constitutional preparation for EU accession in the new Member States, and the influence of European integration on the development of law in Russia.