Professor Lewis did his undergraduate and graduate studies at Cambridge University in England, obtaining his Ph.D. in 1987. His thesis was entitled "Extreme point methods for infinite linear programming." After research fellowships at Cambridge University and Dalhousie University, he moved to the University of Waterloo in 1988, where he is currently Professor in the Department of Combinatorics and Optimization. His current research area is convex and nonsmooth optimization and analysis, with interests mainly in nonsmooth matrix analysis.