Callum Roberts is a professor of marine conservation at the University of York. His disparate research interests range from subjects such as the origins and maintenance of biodiversity on coral reefs, to historical ecology to the ecosystem effects of fishing. He has helped demonstrate that use of marine reserves, areas closed to fishing, can improve the success of fishery management and boost catches from surrounding areas by acting as a reservoir of productive fish stocks. Callum makes frequent contributions to radio and newspapers on the impacts of fishing on the sea and how to achieve sustainable fisheries. His book on this subject, The Unnatural History of the Sea, received the Rachel Carson Environment Book Prize. His most recent book Ocean of Life was shortlisted for the Royal Society book prize and examines the full scope of threats to the sea and what this means to our lives.