His career has been landmarked by several years spent in foreign Universities and Research Institutes (Institute of Industrial Relations, Berkeley, USA, 1981 ; Florence University Institute, Italy, 1989–1990 ; Wissenschaftskolleg zu Berlin, Germany, 1997–1998). Member of the  « Droit social » law review, he also authored numerous books focussing on labor law and social security law (among others : Critique du droit du travail, PUF, 1994) and participated to various collective works (among others : Le travail en perspective, LGDJ, 1998 ; Servir l’intérêt général, PUF, 2000 ; Beyond Employment. Changes in Work and the Future of Labour Law in Europe  Oxford University Press, 2001, 245 p.).
His career has been highlighted by several years spent at foreign Universities and Research Institutes (Institute of Industrial Relations, Berkeley, USA, 1981 ; Florence University Institute, Italy, 1989–1990 ; Wissenschaftskolleg zu Berlin, Germany, 1997–1998). He is a notable figure in the field of social law, having authored numerous books on labor and social security law (Critique du droit du travail, PUF, 1994) and contributed to various collective works (Le travail en perspective, LGDJ, 1998 ; Servir l’intérêt général, PUF, 2000 ; Beyond Employment. Changes in Work and the Future of Labour Law in Europe Oxford University Press, 2001, 245 p.).