Kathryn Johnston is a professor at Columbia University, currently on sabbatical at the Center for Computational Astrophysics. She will be taking up a joint appointment between Columbia and CCA to allow her to lead a new Dynamics Group in Fall 2019. Johnston is interested in understanding how our own Galaxy formed. She pursues this goal using a combination of close collaborations with observational colleagues and computer simulations of galactic collisions. She arrived in this field following an undergraduate degree in mathematics from Cambridge University, a PhD in Astronomy and Astrophysics from UC Santa Cruz and a postdoctoral position at the Institute for Advanced Study in Princeton. She joined the Columbia Astronomy Faculty in Fall 2006, after spending 7 years as an assistant professor at Wesleyan University.