No faculty member sets out to be a bad teacher—at least I hope not—but there are bad (or ineffective) teachers. I’m sure some of these faculty see teaching as an obligatory chore or are indifferent to whether students learn. Then there are those who want students to learn but have not yet figured out how to teach effectively. One root cause of ineffective teaching for all these groups may be faulty beliefs about teaching and learning. Normally, we focus on what the most effective teachers think and do, but it is equally important to identify and avoid harmful beliefs that undermine teaching success.