Sheri Williamson is co-director, with her husband Tom Wood, of the non-profit Southeastern Arizona Bird Observatory in Bisbee, Arizona. She is author of The Peterson Guide to the Hummingbirds of North America. She has authored numerous articles about hummingbirds and the behavior of other species as well. She and Tom also produced the Southeast Arizona Birding Trail map. Sheri and Tom were managers of the Nature Conversancy, Ramsey Canyon Preserve for several years. She co-leads trips to Belize, Ecuador, and Arizona. She resides with Tom in Bisbee, Arizona.