I am interested broadly in the fields of programming languages and software engineering, especially where they intersect. Specifically, my research focuses on static and dynamic program analysis; empirical software engineering; software analytics; software repository mining; automated refactoring; programming language semantics; and program verification. My goal is to provide developers with powerful new tools for understanding, creating, analyzing, and improving software. As part of this, I am a continuing contributor to Rascal, a meta-programming language for program analysis, program transformation, and programming language implementation.