Roger Tory Peterson, one of the world's greatest naturalists, received every major award for ornithology, natural science, and conservation as well as numerous honorary degrees, medals, and citations, including the Presidential Medal of Freedom. The Peterson Identification System has been called the greatest invention since binoculars. These editions include updated material by Michael O'Brien, Paul Lehman, Bill Thompson III, Michael DiGiorgio, Larry Rosche, and Jeffrey A. Gordon.
John Kricher's works include the Peterson Field Guides to Eastern Forests, Rocky Mountain and Southwestern Forests, and California and Pacific Northwest Forests .
Gordon Morrison is a well-known naturalist whose work has been praised by Roger Tory Peterson as "Marvelous, beautiful, excellent . . . Morrison’s work is so inspiring that I wish such clear material was available when I was slowly learning ecology. . . . We owe a debt of gratitude to Gordon for his interpretive skills as an artist. He is a superb teacher who uses visual methods." Robert Bateman likened his work to that of Albrecht Durer and Andrew Wyeth. Gordon Morrison makes his home in Massachusetts.