Tyler Mitchell is the Executive Director of the Open Source Geospatial Foundation (OSGeo) and Editor in Chief of the OSGeo Journal.  He serves on several OSGeo committees, speaks regularly to the international community and works closely with the members and directors to further the OSGeo mission.  Tyler is one the first published authors to address open source mapping technologies in his book Web Mapping Illustrated - Open Source GIS Toolkits (O'Reilly, 2005) which introduced MapServer, PostGIS and GDAL/OGR.