emphasized heterodyne receiver work, while the neighboring James Clerk Maxwell Telescope emphasized continuum detector observations. Most of the heterodyne receivers were built on the Caltech campus, and were placed at the Nasmyth focus. The University of Texas team built instruments for the CSO, including a re-imaging system which effectively converted the 10.4 meter telescope into a 1 meter off-axis telescope with a 3 arc minute wide beam at 492 GHz. This wide beam system was used to map the atomic carbon line at 492 GHz over large regions of the sky. The UT team also provided an 850 GHz receiver for the telescope's Cassegrain focus. In 1986, the CSO obtained official "first light" by producing a spectrum of the carbon monoxide J=2-1 line from the nearby starburst galaxy Messier 82 (although continuum detections of the Moon and some planets had been made earlier). The CSO and JCMT were combined to form the first submillimeter interferometer. The success of this experiment was important in pushing ahead the construction of the Submillimeter Array and the Atacama Large Millimeter Array interferometers. The CSO was also a part of the Event Horizon Telescope array during the early test observations which proved the feasibility of intercontinental mm-wave interferometry. Research Highlights: The first detection of the Sunyaev-Zel'dovich Effect at millimeter wavelengths, and the first measurement of cluster temperature using the Sunyaev-Zel'dovich Effect. The Bolocam Galactic Plane Survey, a survey of continuum emission at 1.1 mm, which covered 170 square degrees of the galactic plane. This survey resulted in the publication of at least 14 journal papers with over 1000 aggregate citations. Discovery of new submillimeter water maser spectral lines at 321, 325, 437, 439, 471, and 658 GHz. Molecular line surveys in the submillimeter band of the star formation regions Sagittarius B2 and Orion KL; the carbon star IRC+10216; and the planets Jupiter and Saturn. Discovery of a ~200 km/sec fast molecular wind from the protoplanetary nebula CRL 618. This fast neutral wind will interact with the slow AGB wind to shape the final planetary nebula. Submillimeter observations of the Solar eclipse of July 11, 1991, a very unusual eclipse in that it passed over several major observatories. Observing the Sun would normally have constituted a severe violation of the telescope's sun-avoidance limits, as it was normally forbidden to allow any sunlight to fall upon even a portion of the telescope's primary mirror. However for this