Sean Lawrence is a Senior Transportation GIS Analyst at the Delaware Valley Regional Planning Commission solving transportation planning problems for planners, engineers, and member governments for over 12 years.  He specializes in ESRI desktop GIS, server, and geodatabase technologies.  He is a GISP, volunteers as Chairperson of the Downingtown Borough Planning Commission, and also as a committee member to the Mid-Atlantic Geospatial Transportation Users Group.