1. Assistant Professor, Dept. of Engineering Technology, Tarleton State Univ.
2. Lecturer, Dept. of Building Technology, Bells Univ. of Technology, Ota, Nigeria.
3. Researcher, Mohammed VI Polytechnic Univ. (UM6P).
4. Assistant Professor, Dept. of Industrial Technology, Univ. of Nebraska, Kearney.
5. Assistant Professor, Dept. of Civil Engineering, Univ. of Jordan.