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 distinguished 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). A member of the "Social Law" review, he has also authored numerous books focusing on labor law and social security law (among others : Critique du droit du travail, PUF, 1994) and participated in 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.).