1. Assistant Professor, Construction Engineering and Management Dept., Faculty of Engineering, Zagazig Univ., Zagazig, Egypt; presently, Assistant Professor, Dept. of Building, Civil & Environmental Engineering, Concordia Univ., Montreal PQ, Canada H3G 1T7.
2. Head of Division of Construction Engineering and Management, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1294.