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Regina Obe holds a BS degree in mechanical engineering from the Massachusetts Institute of Technology with a concentration in Bioelectronics and control theory. She has over 15 years professional experience in various programming languages and database systems. Regina focuses on sales, project cost estimation, high-level programming and troubleshooting, providing technical guidance to programming staff, and one-on-one mentoring to clients in various programming and database disciplines. She is also the resident expert on PostGIS spatial database engine and other Open Geospatial technologies. She is a member of the PostGIS project steering committee and the PostGIS core development team. She is a co-author of the book PostGIS in Action. Leo Hsu holds an MS degree in engineering of economic systems from Stanford University. He also holds dual BS degrees in mechanical engineering and economics from the Massachusetts Institute of Technology with a minor in Finance. He has over 15 years professional experience working for and with Federal, State, non-profits and Dot coms developing automated pricing and process applications and devising workflow strategies. His education and experience runs the gamut from programming, economics, statistics, operations research, database systems and application architecture, mechanical engineering, control theory and game theory. Leo focuses on advanced database design, application architecture, and overall project management. He is the resident SQL expert. He is a co-author of the book PostGIS in Action.