Andy Mitchell is a technical writer with more than 30 years’ experience in GIS. He is the author or co-author of several books, including The Esri Guide to GIS Analysis series and Zeroing In: Geographic Information Systems at Work in the Community. Dr. Lauren Scott Griffin has more than 33 years of experience in software development and GIS at Esri. She has been invited to deliver presentations, workshops, and short courses at the National Institute of Justice, Centers for Disease Control, Johns Hopkins, New York City Department of Health, University College London (UCL) Jill Dando Institute of Crime Science, London Health Protection Agency, Sault Ste. Marie Innovation Center, World Vision, and the University of Copenhagen Institute of Geography.