The interview is conducted by a current second year student, an alumn or by a memebr of the adcom. I had mine at the GSB downtown, with a current student.
Make sure to bring a copy of your resume: it doesn't have to be in the same format as the expanded one that you submitted in the application (I checked with the adcom before my interview). You can use a more traditional format (as I did). One page strict. Use nice paper
Professional interview attire (i.e. suit and tie for guys)
The duration of the interview is approimately 45 minutes. First the resume is provided to the interviewer, who looks over it for a few minutes, then you go in the interview room.
Questions that I was asked were pretty much standard:
* Guide me through your resume/explain to me your career path
* Why an MBA?
* Why the GSB?
* Small talk about my hobbies.
* Five minutes for me to ask one or two questions.
Make sure to have clar answers ready for the standard questions.
Overall the interview was extremely pleasant and conversational. (I was really impressed by the responsiveness and professionalism of everyone at the GSB during the whole app process).
I believe that the GSB reserves the right to answer within 4 or 6 weeks of the date that the application material is submitted (incl. the interview), although usually they take less time than that.