This grant provides two years of continued support to microbiologist Jonathan Eisen at the University of California, Davis for the continued operation and development of the Microbiology of the Built Environment network (microBE.net), a research network and associated website that aims to encourage collaboration, resource sharing, and information exchange in the growing multidisciplinary community of researchers working on understanding the built environment microbiome. Funded activities include the continued operation of the network website, the curation and creation of tools and other resources for researchers, the coordination of several meetings and workshops, and outreach to relevant stakeholders, including researchers, regulators, government funding agencies, and the public.