About the Authors

Regina Obe is a coprincipal of Paragon Corporation, a database consulting company based in Boston. She has more than 20 years of professional experience in various programming languages and database systems, with special focus on spatial databases. She is a member of the PostGIS steering committee and the PostGIS core development team as well as the pgRouting and GEOS development teams. Regina holds a BS degree in mechanical engineering from the Massachusetts Institute of Technology. She coauthored PostGIS in Action (Manning) and pgRouting: A Practical Guide (Locate Press).

Leo Hsu is a coprincipal of Paragon Corporation, a database consulting company based in Boston. He has more than 20 years of professional experience developing and thinking about databases for organizations large and small. Leo holds an MS degree in engineering of economic systems from Stanford University and BS degrees in mechanical engineering and economics from the Massachusetts Institute of Technology. He coauthored PostGIS in Action (Manning) and pgRouting: A Practical Guide (Locate Press).