Hendrik G. Herlyn works as a freelance translator in the fields of ornithology, forestry, and natural science. He is a contributor to Birds of Oregon and to Oregon Birds and American Birds magazines and field editor for the Audubon Society of Corvallis. He has participated in ornithological projects in Europe and North America.
Alan Contreras has studied the birds of Oregon for over thirty years. He is past president of Oregon Field Ornithologists and has written and edited several books on Oregon birds, including Northwest Birds in Winter and Birds of Oregon: A General Reference. He lives in Eugene, Oregon.