Jet Propulsion Laboratory
The Jet Propulsion Laboratory (JPL) based in Pasadena in the United Sates is one of the many NASA research centres. It is directed by the California Institute of Technology (Caltech), the famous American university.
The JPL is the main American centre for the robotic exploration of the solar system. It has directed several projects such as the Pioneer, Viking, Voyager and more recently the Galileo probes, the Mars Pathfinder missions and the two robots in the Mars Exploration Rover (Spirit et Opportunity) mission, Cassini-Huygens.
The JPL web site.