Dr. Al-Mohanna obtained his B.Sc. (1982) from faculty of Marine Sciences , King Abdulaziz University , Jeddah , Kingdom of Saudi Arabia and was appointed to the position of administrator in (1983) at faculty of Meteorology , Environment and Arid Land . In 1988, he obtained his Ph.D. from University of Wales in Environmental Pollution and was appointed Assistant Professor .
Dr. Al-Mohanna has been actively engaged in education, research, consulting and advisory services in various field of environment aspects. He was a member of the scientific team who was studying extents and impacts of the oil spill in the Arabian Gulf during the Iraqi Kuwait conflict (1991).