This Proceedings contains a selection of papers presented at the joint meeting of The American Ceramic Society's (ACerS) Glass and Optical Materials Division (GOMD) and the 18th University Conference on Glass, held in Rochester, NY on May 20-23, 2007. The theme of the University Conference was Mass Transport Phenomena in Glasses and Glass-Forming Melts and included contributions on topics such as gas diffusion and solubility, crystallization behavior, ionic conductivity, and chemical durability. The GOMD program included sessions devoted to optical materials, biological interactions with...