1991-1993 Strabag Bau AG 1993-1998 Scientific Assistant, TU Darmstadt 1998-2001 Bollinger + Grohmann, Frankfurt 2000-2008 Guest Professor, Städelschool Frankfurt since 2002 Professor Structural Design and Construction, University of Kaiserslautern 2002 Foundation osd since 2007 Guest Professor, TU Graz
