Hanna Wallach is an assistant professor in the Department of Computer Science at the University of Massachusetts Amherst. She is one of five core faculty members involved in UMass's newly-formed computational social science research initiative. Prof. Wallach's primary research goal is to develop new machine learning methods for analyzing text and network data arising from complex social processes, including the US political system, the US patent system, and free/open source software development communities. Her research contributes to machine learning, Bayesian statistics, and, in collaboration with social scientists, to the nascent field of computational social science. Prof. Wallach holds a B.A. in Computer Science from the University of Cambridge, an M.S. in Cognitive Science from the University of Edinburgh, and a Ph.D. in Physics from the University of Cambridge. In her not-so-spare time, Prof. Wallach (or Logistic Aggression, as she is better known) likes to put on roller skates and hit people really, really hard.