Adrian Stephen Lewis (born 1962 in England) is a British-Canadian mathematician, specializing in variational analysis and nonsmooth optimization.
His doctoral dissertation is titled Extreme point methods for infinite linear programming.
[2] Lewis has held visiting appointments at academic institutions in France, Italy, New Zealand, the United States, and Spain.
He is a co-editor for Mathematical Programming, Series A and an associate editor for Set-Valued and Variational Analysis[3] and for Mathematika.
"[1] With Jonathan Borwein he co-authored the book Convex Analysis and Nonlinear Optimization (2000, 2nd edition 2006).