Jorge Arévalo is a computer engineer from Universidad Autónoma de Madrid, UAM. He started developing web applications with JS, PHP, and Python in 2007. In 2010, he began collaborating with PostGIS and GDAL projects after participating in GSoC 2009, creating the PostGIS Raster GDAL driver. He currently works as a technology trainer and Python/Django developer. He also organizes hackathons with others at http://hackathonlovers.com/.

Jorge Arévalo has co-written the book Instant Zurb Foundation 4 for Packt Publishing. He has also worked as reviewer for the books PostGIS Cookbook, OpenLayers 3 Beginner's Guide, and Getting Started with Memcached, all of them for Packt Publishing.

Olivier Dalang completed his master's degree in architecture and urban planning from EPFL, Switzerland. He then worked as an urban planner at Team+ as a volunteer for the NGO urbaMonde, which is active in Senegal, and as a researcher and lecturer at EPFL on the Venice Time Machine project. He got more and more acquainted with QGIS through the different positions he worked in. Being a programmer, he developed a few plugins, of which a few are now in the core.

Ben Mearns lives in Philly, PA, where he consults, teaches, advises, speaks, and creates geographical information. In private practice, he has previously been the lead geospatial information consultant and instructor on GIS for natural resource management at the University of Delaware. He has held other GIS and data positions at the Cartographic Modeling Lab at the University of Pennsylvania, Princeton University, and Macalester College. He is currently writing QGIS Blueprints with Packt Publishing, which will soon be available in the market.