Kenneth Lange is the Rosenfeld Professor of Computational Genetics, and a faculty member in the Departments of Biomathematics, Human Genetics and Statistics, at the University of California, Los Angeles. He has held appointments at the University of New Hampshire, Massachusetts Institute of Technology, Harvard University, the University of Michigan, the University of Helsinki and Stanford University. He is a Fellow of the American Statistical Association, the Institute of Mathematical Statistics, and the American Institute for Medical and Biomedical Engineering. He won the Snedecor Award from the Joint Statistical Societies in 1993 and gave a platform presentation at the 2015 International Congress of Mathematicians. His research interests include human genetics, population modeling, biomedical imaging, computational statistics, optimization theory, and applied stochastic processes. He has published four previous books: Mathematical and Statistical Methods for Genetic Analysis, Numerical Analysis for Statisticians, Applied Probability, and Optimization, all in second editions.