Updated May 2004 Alan M. MacEachren is currently Professor of Geography and Director of the GeoVISTA Center at The Pennsylvania State University. In addition to researching cognitive and semiotic aspects of how maps work, he is active in the development of interactive systems for geographic visualization and in understanding and enabling group work with geospatial information and technologies. He is the author of [i]Some Truth with Maps[/i] and coeditor of [i]Visualization in Modern Cartography[/i].