Professor Ali Yazdani is the Class of 1909 Professor of Physics and the Director of the Princeton Center for Complex Materials at Princeton University, which uses high-resolution scanning tunnelling microscopy to study correlated electronic states, including high-temperature superconductors, heavy fermion systems, disordered semiconductors, and topological quantum states. Professor Yazdani is a Fellow of the American Academy of Arts and Sciences, American Physical Society, and the American Association for Advancement of Science. Recently, he has been a Loeb Lecturer at Harvard, Lamb lecturer at the Max Planck Institute in Stuttgart, and Einstein Lecturer at Weizmann Institute of Science.