Jos Lehmann was born in Milan, Italy, on December 23rd, 1971. At the end of 1995 he was awarded a Master's Degree by the University of Milan, Faculty of Philosophy, for a thesis on the logical and epistemological aspects of the Frame Problem in Artificial Intelligence (supervisors prof. Andrea Bonomi, prof. Marco Colombetti). He then moved to Amsterdam, The Netherlands, where he worked, first, as a cook and a cleaner at Ter Kuile café and as a trainee at the Information Resources Department of Levi Strauss Benelux (1996); then, as a knowledge engineer for the software company Sentient Machine Research (1997); and, finally, as a junior researcher at the University of Amsterdam, Faculty of Law, Department of Computer Science and Law - Leibniz Center for Law (1998-2003). In March 2003 he was awarded a Ph.D. Degree by the University of Amsterdam for a dissertation on the problem of Causation in Artificial Intelligence and Law (supervisors prof. Joost Breuker, prof. Bob Brouwer).

At present Jos Lehmann is collaborating with the Laboratory for Applied Ontology, in Rome, on various themes connected to his research interests: knowledge representation, ontology and causation.