[1] He has always been an avid hiker, fly fisher, photographer, wildlife watcher and has continuously documented his experience in his writing.
In an interview with Yellowstone Science, he tells how he was pretty clueless going into the job, and initially intended to become a park ranger, but then showed up to find that he was going to be a ranger-naturalist and would have to talk in front of people.
Some of the pieces he has written on nature include The Bears of Yellowstone, The Grand Canyon, American Bears, Mountain Time, Searching for Yellowstone, America's National Parks, Real Alaska, Lewis and Clark Among the Grizzlies, and This High, Wild Country.
[3] He has also written for all sorts of scholarly publications, for example Encyclopædia Britannica Yearbook of Science and The Future and Bioscience to The New York Times.
[4] While working at Yellowstone as a historian, Schullery helped to draw attention to the importance of issues involved in the history of the park movement in America, and how they overlapped with what was going on at the time.
Not only did his writing help spread knowledge about Yellowstone, but he also contributed many books about fly fishing which were commonly written including in-depth information with regard to the sport.
All in all, his writings about nature and fly fishing helped not only to expand public knowledge on the topics but also to spread the word about the sport and important issues altogether.