The Multiple-Element Gamma Assay (MEGA) is a low-background detector designed to support environmental monitoring and national security applications. MEGA also demonstrates technology needed for Majorana, a next generation neutrino mass experiment. It will employ active and passive shielding to reduce backgrounds. It will also exploit multi-coincidence signatures to identify specific radioactive isotopes. MEGA is expected to begin operation in late 2003 at the Waste Isolation Pilot Plant in Carlsbad, NM.