Each student at Cambridge has a Director of Studies whose task it is to keep a student's academic progress under review, advise on choice of courses and recommend specific programmes of study.
A College officer responsible for the overall conduct of a student's academic work, including advice on examinations and lectures, and for the assignment of the student to one or more Supervisors. The term Tutor is not used in Cambridge in this connection.
The person who organises your academic life. Your DOS will usually be a fellow of Corpus, but for a few minor subjects you might have a DOS based in another College. His or her main duties are to talk to you about your work at the beginning and end of term (and at any other time as might be necessary), arrange supervisions for you, and generally tell you about anything you need to know related to your course - such as information about exams. Depending on your subject, your DOS may or may not also supervise you.
The person, normally a Fellow of the College, who organises teaching and monitors the progress of students in a particular subject. Directors of Studies are specialists in the subject studied by their students.
a Fellow (see below) of the College (or occasionally of another college) responsible for arranging supervision teaching (see below) in a particular subject, and for overseeing the progress of individual students in that subject. Each Director of Studies is a specialist in the subject that the student is studying.
A Senior Member (see below) of Newnham (or occasionally of another college) responsible for arranging the teaching of students in a particular subject and for overseeing their progress. Each Director of Studies is a specialist in the subject that the student is studying.