In October 2004, Photon was acquired by Raytheon. Photon Research Associates, Incorporated (PRA) is a leading provider of physics-based modeling, simulation and analysis products for government and commercial markets. Customers use PRA's expert research services and software tools for electro-optical sensor design; aircraft and satellite simulation; mission planning and analysis; algorithm development and data warehousing. The company has ix locations throughout the United States including Moldyn, Inc., its bioinformatics/molecular modeling subsidiary. PRA staff have expertise in the following disciplines: Physics, Astronomy, Engineering, Applied Mathematics, Geography and Computer Science. PRA employees enjoy an energized working environment that rewards longevity and dedication.