Full Professor of Law, University of Huelva,

Head of Department of Administrative Law, 1998-2007.

Professor of Law, University of Seville, 1990-1998.

Director, Comparative Law University Institute, University of Seville, 1990-1994.

Visiting Professor positions:

European University Institute, Florence, Spring- Summer  2003 (Italy).

University of Trento, Fall 2004 (Italy). University of Edinburgh, Spring 1992, (UK).

Visiting Academic/Researcher:

University of Cologne, 1990-1992 (Germany). University of Heidelberg and Max-Planck-Institute, 1991, 1993, 2000, 2001, 2002, etc. (Germany). University of Florence, 2003 (Italy). Academy of Administrative Sciences, Speyer, 1993 (Germany). NYU, 1999, 2008, New York (USA), etc.