"The Software Engineering Institute (SEI) is a federally funded research and development center sponsored by the U.S. Department of Defense through the Office of the Under Secretary of Defense for Acquisition, Technology, and Logistics [OUSD (AT&L)]. The SEI contract was competitively awarded to CarnegieMellonUniversity in December 1984. The SEI staff has extensive technical and managerial experience from government, industry, and academia." -- From their about page.
Best known for introducing the CapabilityMaturityModel (CMM).
Some good SEI links:
CategoryCompany, sort of