<p>You’re right, different professors teach it in different semesters. It’s not always one per year. Greenhill, for example, I believe only taught one semester (I don’t know that they’ll ask her to teach it again - she’s great but she’s a bit too demanding for an intro-level course). Any poli sci professor with an IR focus could be called upon to teach Intro to IR, so in addition to Mufti, Taliaferro, and Greenhill, there’s also Eichenberg and Tony Smith. In a pinch, one of the non-tenured IR-focused poli sci faculty like Nancy Gleason or Katrina Swett could probably be asked to teach Intro to IR as well, though this is unlikely and would probably require multiple simultaneous sabbaticals.</p>
<p>I took Intro to IR with Mufti. I would actually say he’s the best prof to take it from. He’s extremely attentive to students, makes it easy to pick out the most important concepts and ideas, and is a pretty decent lecturer (though he definitely sounds not unlike Kermit the Frog with an accent). Taliaferro is strongly opinionated enough that he can be quite polarizing, Greenhill is an amazing professor but works you a bit hard for an intro class (don’t fail to take an upper-level course with her, though), and Eichenberg is a nice guy, but boring. I don’t know anything about Tony Smith.</p>