The instructor teaches lectures and manages the overall course. Contact the instructor if you have a question that cannot be answered by your section leader; the SLs are your primary email contact for all questions about homework or other course issues. Please also cc your section leader and/or Head TA. In addition to at his office hours, please feel free to ask Colin questions before/after any lecture.
The Head TA manages the section leaders and also oversees important course activities such as grading and section problems. Contact the Head TA if you need a regrade on an assignment, or have a question that cannot be answered by your section leader; the SLs are your primary email contact for all questions about homework or other course issues. Please also cc your section leader and/or instructor.
Your section leader is your primary point of contact if you need help with homework, grading, section or most other course issues. To find out who your section leader is, or the time/place of your section, click on the "View My Section" link in the "Section" dropdown at the top.