Ken Gerow, Professor of Statistics at the University of Wyoming, earned a Bachelor's degree in Wildlife Biology (minor, Statistics) from the University of Guelph. He has been on the faculty at U.W. ever since completing his Ph.D. in Statistics at Cornell University. He has devoted his career to empowering biologists with statistical concepts and tools. His publications are in a wide range of biological disciplines and journals, with much of his work being directed towards fisheries science. A distaste for making students do arithmetic (rather than thinking about science and valid use of appropriate statistical tools) led to the creation of the interactive Excel tools that accompany this text.