William M. Deen is the Carbon P. Dubbs Professor Emeritus in the Department of Chemical Engineering at Massachusetts Institute of Technology (MIT). He is an author of some 200 research publications in bioengineering, colloid science, membrane science, quantitative physiology, and toxicology, most involving aspects of diffusion or fluid flow. During his 40 years of teaching at MIT, he has focused on undergraduate and graduate fluid mechanics, heat transfer, and mass transfer. He is the author of Analysis of Transport Phenomena (2012), which is used internationally in graduate-level transport courses. Among his awards are the 2012 Bose Award for Excellence in Teaching from the MIT School of Engineering and the 2012 Warren K. Lewis Award for Contributions to Chemical Engineering Education from the American Institute of Chemical Engineers.