Mark is a Chartered Biologist, a Chartered Environmental Scientist, a Chartered Science Teacher, a Certified Wildlife Photographer and a Prince II Certified Practitioner with a wide range of experience in Environmental Education and Sustainable Development. Mark has been entrusted as a member on various national and international boards. He is presently co-ordinating the masters in education for sustainable development at the University of Malta and holds adjunct status at James Madison University, Harrisonburg, the US. He also held teaching posts at the University of Ca Foscari Venice, Italy, at Southern New Hampshire University in the US and at the University of Yaounde, Cameroon.