It's best to enter the Stata Center at the intersection of Vassar Street and Main Street. Walk through the hallway (called the "Student Street") to the information desk, then turn right to look at the bank of three elevators that lead up to the Gates Tower:
Take the elevator to the 8th floor:
When you exit on 8, you will be looking at a pair of glass doors. Hopefully these doors will be open If they aren't, you need to call me on my cellphone (617-876-6111) or in my office (617-253-6023) so that I can come and open the doors for you. Otherwise, walk through the open doors and turn right.
Go down the hallway and immediately turn right, just after the water fountain:
Now walk past the little kitchen area and walk through the glass door:
Room 32-G828 is straight ahead. Hopefully the door is open and I am sitting at my desk: