Nathan S. Lewis is the George L. Argyros Professor of Chemistry at the California Institute of Technology. He specializes in functionalization of silicon and other semiconductor surfaces, as well as chemical sensing using chemiresistive sensor arrays. He obtained his B.S. and M.S. degrees also at Caltech under Harry B. Gray in 1977 studying the redox reactions of inorganic rhodium complexes. After that, he moved to the Massachusetts Institute of Technology for his Ph.D. in 1981 under Mark S.