Senior Research Scientist
CurrentI manage the Openproof project where we develop courseware for teaching logic. Our packages include Language, Proof and Logic which has been translated into German, Japanese and Portuguese; Tarski's World which has been in print since the mid 1980s and Hyperproof which will soon be republished in a new edition.Our courseware packages consist of text books, desktop applications and online services, including video lectures available through Stanford Online.As part of this project we analyze learner data to uncover error patterns common to logic learners.I also have an active research program into the logic of diagrammatic representations.