As previous reviewers have already written thoroughly on the intelligence, ability, and attractiveness of Nick, I am going to focus on how dedicated he is. Actually, let facts do the talk:
Fact 1: He hosted extra office hours the Sunday before Hurricane Sandy landed Manhattan. I believe the last appointment was after 10 PM.
Fact 2: That wasn't the only time he hosted extra office hours. He always made time to meet the students, even though he was extremely busy.
Fact 3: He would read someone's draft even if that person was not in his session. (there were three sessions in this class)
Fact 4: If he ever promised someone something during a conversation, he made that happen.
Fact 5: There weren't recitation sessions for Philosophy of Law (there should be!), however he and Jonathan Fine (the other TA) volunteered to host a review session for the students.
Fact 5.1: The food at the review session was good.
Fact 6: He always made one feel welcomed
Fact 7: He said he loved teaching.
Fact 8: He was very helpful.
Observation 1: He loves philosophy, especially moral philosophy (*meta-ethics). Ask him about it.
Observation 2: He gives amazing study tips. Follow them.
Conclusion 1: He cares about his students.
Conclusion 2: You will miss a lot if you don't get to know him personally.
-To students: If you ever get a chance to pick you teaching assistant, I highly recommend you to choose Nick.
-To the rest: Tenure him.