NASA has many facilities throughout the country, but in terms of science personnel, this facility is the largest. Abbreviated "GSFC". and named for an important figure in early American rocketry identify this facility, NASA's chief design facility, located in Greenbelt, Maryland. (We'll take the person it is named for ... we don't need the whole name).
(Robert H.) Goddard (Space Flight Center) (edited at 3:29 pm, August 3, 2017 (PDT))
Original Answer: Goddard (Space Flight Center)