1. Associate Professor, Structural Engineering and Construction Management Dept., Faculty of Engineering and Technology, Future Univ. in Egypt.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Universidad de los Andes, Bogota, Colombia.
3. Independent Researcher and Interamerican Development Bank Consultant, Bogota, Colombia.
4. Assistant Professor, M.E. Rinker, Sr. School of Construction Management, Univ. of Florida, Gainesville, FL.