Jeffrey Levinton is Professor of Ecology and Evolution at Stony Brook University and has worked for many years as a researcher in marine ecology and as a textbook writer in marine biology. He has been a Guggenheim Fellow, a Fulbright Senior Fellow and has done research and lectured at many institutions throughout the world. He is also the recipient of the State University of NY Chancellor's award for excellence in teaching. John Waldman is Professor of Biology in the City University of New York. He is a well known fisheries scientist and is the author of a number of popular books in natural science. Before coming to Queens College of the City University of New York, he worked for 20 years as senior scientist of the Hudson River Foundation.