JPL

List of known employees:
Bruce Ng - The Director of JPL

Tim Grimes

Ryoko

JPL was responsible for constriction of many of the Ares Equipment pieces for surface operations. All Ares rovers were built and tested by JPL, as well as the MAV, MDV, Hermes Control module, communication systems, and internal HAB components. JPL was also responsible for maintaining contact with Mark Watney after he had retrieved Pathfinder, which was also built by JPL.

[Copy pasted from Wikipedia]
The Jet Propulsion Laboratory (JPL) is a federally funded research and development centre and NASA field centre located in La Cañada Flintridge, California and Pasadena, California, United States.

The JPL is managed by the nearby California Institute of Technology (Caltech) for NASA. The laboratory's primary function is the construction and operation of planetary robotic spacecraft, though it also conducts Earth-orbit and astronomy missions. It is also responsible for operating NASA's Deep Space Network.

Among the laboratory's current major active projects are the Mars Science Laboratory mission (which includes the Curiosity rover), the Cassini–Huygen smission orbiting Saturn, the Mars Exploration Rover Opportunity, the Mars Reconnaissance Orbiter, the Dawn mission to the dwarf planet Ceres and asteroid Vesta, the Juno spacecraft orbiting Jupiter, the NuSTAR X-ray Telescope, and the Spitzer Space Telescope. They are also responsible for managing the JPL Small-Body Database, and provides physical data and lists of publications for all known small Solar System bodies.

The JPL's Space Flight Operations Facility and Twenty-Five-Foot Space Simulator are designated National Historic Landmarks.