Each graduate field has a Director of Graduate Studies, known as the DGS, who is responsible for M.S./Ph.D. students in his or her graduate field. The office of the DGS is responsible for maintaining graduate student records, processing applications and admissions decisions, and completing other administrative tasks. The DGS is a useful person to know if you wish to change student status, change your Special Committee, or get an opinion on any issue that you don't want to take to your own committee members for any reason.
The Director of the M.Eng. program in each department serves in a similar capacity for M.Eng. students.
The Graduate Field Assistant (GFA) for each graduate field is the administrative assistant who assists the DGS and Director of the M.Eng. program with their respective tasks. The GFA in your field is a very important person to get to know; he or she can often serve as a helpful first point-of-contact for many questions and problems. In most fields, the same GFA serves both the M.Eng. program and the M.S./Ph.D. program.