John Sipe is a Professor in the Department of Physics at the University of Toronto, where he received his Ph.D. He is a theorist who works on problems in optical and condensed matter physics.His current research focuses on optical properties of ring resonators and other artificially structured materials, and their use in quantum and nonlinear optics; coherent control and transport of carriers, spins, currents, and spin currents in bulk and nanostructure semiconductors; application of structures with optical resonances to problems in biosensing; foundational problems in quantum mechanics. He is a Fellow of the American Physical Society, the Optical Society of America, and the Royal Society of Canada.