My office is Aiken 233, and my office phone number is 496-6246 (9am-5pm), and my home phone number is 643-9644 (6pm-10pm). Please do not call me after 10pm, or before 10am on weekends.
Note that my office phone is shared with several other people. Please do not treat them like an answering service.
By far the best way to reach me (or anyone on the CS50 course staff) is via email. My email address is firstname.lastname@example.org. The email address of the course account is email@example.com.
email is also the easiest way for me to get information to you, so please check your mail at once a day or so during the week.
I usually also have office hours Tuesday 2-4 and Wednesday 2-3 in Aiken 233. Anyone is welcome to drop by.