Bradley Siwick is an Associate Professor in the Departments of Physics and Chemistry and the Center for the Physics of Materials at McGill University in Montreal, Canada. He holds the Canada Research Chair in Ultrafast Science and directs a research program focused on atomic-level studies of structural dynamics in molecules and materials using a combination of time-resolved diffraction and spectroscopic techniques. Since his Ph.D. at the University of Toronto (2004), his primary focus has been on developing electron diffraction instrumentation with femtosecond time resolution and on pursuing the many applications of this technique to complex problems in materials physics.