With the complexity and contradictions associated with conceptualizing learner-centered (LC) education, teachers need support to transform their teaching into LC. Teachers who are expected to teach using teacher-centered practices, like teachers in India, also need this support; however, little is known about these teachers' LC knowledge,…

If we want mathematics education to be valuable to everybody, including those who do not pursue mathematics-related careers, we need to use mathematics as a training ground for certain ways of thinking. This dissertation focuses on one aspect of mathematical thinking, namely theory building. It has three parts -- unpacking what constitutes theory…