Developments and applications of radio interferometry techniques for geodesy were the subjects of a meeting at the Massachusetts Institute of Technology in Cambridge and the Northeast Radio Observatory Corporation's Haystack Observatory in Westford, Massachusetts, on June 19–21,1979. One hundred thirty persons from eight countries attended the meeting, which was cosponsored by the American Geophysical Union and the U.S. National Aeronautics and Space Administration (NASA), Office of Space and Terrestrial Applications, in cooperation with Special Study Group 2.51, on radio interferometry techniques, of the International Association of Geodesy (IAG). Fifty-four papers treated practically all aspects of this rapidly maturing geodetic method. Papers presented at the meeting are being collected in a NASA Conference Publication by Robert J. Coates of NASA Goddard Space Flight Center. This publication should be available by January 1980.