Dalia Varanka teaches Geospatial Ontology and Semantics for the Geographic Information Systems (GIS) degree program at the Johns Hopkins University Advanced Academic Program and is a Research Scientist with the U.S. Geological Survey (USGS). Dr. Varanka’s graduate degrees focused on urban environmental geography and spatial information theory. Dr. Varanka began her Federal career in 1993 with the U.S. Bureau of Land Management practicing Geographic Information Systems (GIS). She joined the USGS and has been a research scientist since 1999 with the National Geospatial Program, home of the national topographic mapping program. Dr. Varanka leads the Geospatial Semantics and Ontology project “The National Map as Knowledge Base” of the Center of Excellence for Geospatial Information Science. Dr. Varanka serves as Chair of the International Cartography Association Commission on Geospatial Semantics.