He's not only a phenomenal teacher, but also an extremely nice guy. I had him as a recitation instructor (imagine that -- Walter Lewin teaching a freshman phys

He's not only a phenomenal teacher, but also an extremely nice guy. I had him as a recitation instructor (imagine that -- Walter Lewin teaching a freshman physics section, rather than being the main lecturer!) and for years after, he would e-mail the people from our section about interesting physics news, meteor showers, and the like.