Full Professor of Ecology at the University of Florida (USA). His core personal research focuses on a wide range of theoretical and conceptual issues at the population and community levels of ecological organization, and on the task of linking ecology with evolutionary biology. In addition to basic research, he is interested in bringing modern ecological theory to bear on significant applied problems, particularly in conservation biology. He has also carried out large-scale experiments on habitat fragmentation. His students include both theoreticians and empirical, experimental ecologists. He has historically collaborated with many faculty at a wide range of institutions, both inside and outside the USA.