Willington Siabato is a Teaching Fellow at the Department of Topographic Engineering and Cartography from the Technical University of Madrid. He is also Research Assistant at the Laboratory for Technology and Information in Geoscience (LatinGEO – Centro GeoI+D). His teaching and research interests include spatial analysis and geographic information systems (GIS), temporal GIS, temporal and spatiotemporal reasoning, geosemantics, geographic and temporal information retrieval, mark-up languages, and Geographic Information Sciences (GISci). Recently, his research has focused on semantic and temporal components of geographic information, development of virtual map rooms, and aeronautical information management and geoservices. He obtained his BSc. degree in Land Surveying (Hons) from the Distrital University of Colombia. Then, he went on to do a Masters degree in GIS from the Pontificia de Salamanca University. Currently, he is writing his doctoral dissertation on semantic and temporal components of GI. He is member of the OGC WG's on GML and Aviation domains.