Perhaps he has lectured, but NYU's website listed him as merely the director (?) of the Brennan Center. If he has some experience, I'd feel better. And I did not know about the sit-in and switch policy. I'll have to see whether 1Ls can do that. Part of the problem is that none of the other classes really interests me, even given the impressive lineup of professors.
And, yes, Gersen...sigh...'tis better to have loved and lost than never to have loved at all.