Alexandre Eremenko

His lectures are coherent and make perfect sense, and he goes over examples that are similar to the homeworks. Although comming toward the end of a power hour you just wish he'd stop (he almost never lets out early). There usually aren't any surprises on the homeworks, but the tests are another story. Just knowing the stuff isn't enough. You have to understand it. 2-3 questions out of around 8 are not straight out of the coursework and you have to figure something out by yourself. Usually you either have to think of a neat trick or just brute force it. He also doesn't curve generously.