Abstract: LIGO's three gravitational wave interferometers in Hanford, Washington and Livingston, Louisiana have been undergoing commissioning since early in 2001. The progress in commissioning and noise performance of the system will be described. A first science run was conducted in summer 2002 and the performance of the detectors, methods used in data analysis, and the first observational results will be presented. These include limits on the rate of neutron star binary system inspirals in our local galactic region, limits on unmodeled burst sources, limits on a candidate pulsar source and limits on stochastic gravitational wave fluxes. LIGO has carried out an additional science run with much improved sensitivity and is currently conducting a third improved sensitivity run. The detector performance during these runs, and possible sensitivity for various sources will be discussed.