Many excellent scholars stood at the cradle of sociology of law, but, with Klaus F. Röhl, it can be said that Ehrlich’s book “Grundlagen der Soziologie des Rechts” (“Foundations of the Sociology of Law” in Moll’s English translation) forms the “foundation document” of our subject discipline. In September 2022, 100 years after his death, two conferences were organized to celebrate Ehrlich’s work to take stock, and assess its relevance for the future. One of the conferences was organised at the Sorbonne University in Paris, the other at the Max-Planck Institute for Legal History and Legal Theory in Frankfurt-on-Main. All in all, both conferences reflect a renewed interest in the works of Eugen Ehrlich, its predecessors, contemporary relations, and the fluctuating and selective impact of his work.