He has developed a specialization on fundamental rights case law, particularly third country nationals’ affairs, so much so he is considered as a reference in immigration and asylum law in France. Henceforward, as member of different associations, Serge Slama participates to the preparation of numerous cases and amici curiae introduced in front of supreme courts either at the national level (Conseil d’Etat, Cour de cassation, Conseil constitutionnel) or at the European level (Court of Justice of the European Union, European Court of Human Rights).