Tim has a Ph.D. in Educational Psychology from the University of Wisconsin-Madison and a Masters degree in Mathematics and Cognitive Science from the same institution. Most recently, Tim comes to us from the University of Illinois at Chicago where his research on undergraduate mathematics education focused on theories of advanced mathematical thinking and learning and how those theories suggest students learn particular mathematical concepts, such as limit, derivative, and absolute value. During the September colloquium series Tim presented a talk entitled: Directly supporting a second conceptual structure: the case of the formal definition of limit. about student thinking on limits. He continues to advance his previous research here at UMaine as well as beginning a new study on incoming-student Calculus readiness.