Time as a faculty member is a more precious resource than I ever imagined. As such, I can be kind of hard to contact. If you are trying to find me to talk about something, email is my preferred method --- it gives me a chance to defer answering until I have a chance to respond thoughtfully to whatever you might be asking.
Please note that I am not at MIT this year. I am on sabbatical; see my travel page for my details.
Some more general contact notes:
If you would like to speak on the phone, please send me an email and set up an appointment first. I hate acting like such a prima donna, but I can't get anything done unless I control my schedule very carefully. (As one of my colleagues likes to say "I have lots of free time; it just all comes in 5 minute blocks.")
I'm a high school student doing a report on black holes. If you could help me to understand the following thing I read about, I would really appreciate it.
A bad example is
Hey dude, I was wondering about black holes. Could you like tell me about them? Oh, and could you send me a 1 page single spaced answer by like tomorrow at 8 am? That's when my report is due.
I'm very sad to report that the bad example is based on a real email I received (albeit I've improved the spelling and grammar).
MIT: I sometimes get queries about coming to MIT. I'm happy to answer general questions, but please bear in mind that I'm not connected to admissions (undergraduate or graduate). I can tell you about the place and answer some questions, but the people who can tell you about admissions are here. (Specific information about the MIT physics Ph.D. program is here.) Please don't get bent out of shape if my answer to your question is "I don't have a clue!"