John F. Mitchell is an Argonne Distinguished Fellow and Associate Director of the Materials Science Division at Argonne National Laboratory. He received his A.B. from Cornell University in 1987 and his Ph.D. from the University of Chicago in 1993 for theoretical studies of defect structures and order-disorder transitions of early transition metal chalcogenides. His current research emphasizes materials synthesis, crystal growth, and studies of correlated electron materials, quantum magnets, and topological matter.