Senior Lecturer, Universiti Malaysia Pahang .
National Schools of Applied Sciences of Safi,University of Cadi Ayyad,Morocco
Bangui University,Central African Republic.
Central University of Haryana, Mahendergarh (India)
INSTITUTE OF MANAGEMENT AND TECHNOLOGY (IMT), ENUGU
Osun State University
National Central University
Azerbaijan Medical University, General and Toxicological Chemistry Department
Oral Cancer Research Center Taiwan.