Landsat is a joint effort of both USGS and NASA. USGS conducts Landsat operations and NASA develops and launches new satellites that meet USGS requirements. In addition to imagery of natural hazard events, Landsat provides valuable data for land use research.
Source: Jon Campbell, USGS
For further information:
+ USGS press release

Landsat Goes to the Library
Landsat made a solid showing at the annual ALA conference (considered “the world’s biggest library event”) in Washington, D.C. this month.