Mark is a tropical ecologist trained at Oxford University, Imperial College and the Open University. His 40-year career began with research in the savannas and forests of East and West Africa and Southeast Asia, including numerous scientific expeditions. Later he became executive director of environmental and international organisations. Amongst his 11 books and 140 articles and papers, Mark co-authored IUCN Red Data Books on Invertebrates and Swallowtail butterflies and several volumes on tropical rain forests. Currently a Trustee of Earthwatch (UK), as well as Chair of GCT, he has also served the Darwin Initiative Expert Committee,the Total Foundation, Fauna and Flora International, Wildscreen and the UK Zoo Inspectorate. He was awarded the 2000 Royal Geographical Society Busk Medal “for contributions to conservation policy and research”. Travel in Galapagos has reinforced his commitment to continuing the vital research at the Charles Darwin Research Station and across the Islands.