1. Associate Professor, Dept. of Civil and Environmental Engineering, Universidad de los Andes, Carrera 1 No. 18A-70, Edificio W, Piso 3, Bogotá, Colombia; presently, Visiting Scholar at Technical Univ. Munich, Munich, Germany.
2. Professor Dr. Habil, Institut für Tragwerksbau, Technical Univ. Munich, Arcistrasse 21, D80290 Munich, Germany.