Hansen's Field Guide to the Birds of the Sierra Nevada

Keith Hansen illustrated and coauthored Hansen’s Field Guide to the Birds of the Sierra Nevada (Heyday,2021), a field guide companion to Birds of the Sierra Nevada: Their Natural History, Status, and Distribution. He is a professional bird illustrator whose images have been featured in Discovering Sierra Birds; Birds of Yosemite and the East Slope; and Natural History of the Point Reyes Peninsula, among other books.

Edward C. Beedy, who has a PhD in zoology, has authored numerous technical publications and articles about Sierra birds. He is the co-author of Birds of the Sierra Nevada and Discovering Sierra Birds.

Adam Donkin designs apps for major tech companies in Silicon Valley. He is co-founder of Flock LLC., where he creates mobile app experiences that encourage people to fall in love with nature through birding.