Dawn J. Wright is a geographer, oceanographer, and the Chief Scientist of Esri. She is a leading authority in the application of geographic information system (GIS) to environmental science and the author and editor of numerous scientific books and articles.Christian Harder is a technology writer and information designer at Esri. He is the author or coauthor of numerous books on GIS, including Understand GIS, The ArcGIS Book (Esri Press, 2017) and The ArcGIS Imagery Book (Esri Press, 2016).