1. Misr University for Science and Technology (MUST),Faculty of engineering,Dept. construction engineering and management (Lecturer Assistant),Giza,Egypt
2. benha University,Faculty of Engineering,Dept. Civil engineering (Professor of Construction Management),Giza,Egypt
3. Housing & Building National Research Center,Dept. Construction engineering and management (Professor of Construction Management),Giza,Egypt
4. benha University,Faculty of Engineering,Dept. Civil engineering (Assistant Professor of Construction Management),Giza,Egypt