- Shadow of the Wolf (2017)
- Shadow of the Jaguar (2018)
- Shadow of the Bear (2019)
- Shadow of the Fox (2021)
- Shadow of the Griffin (2023)
Literatúra faktu:
- The Making of a Ranger:A Memoir of a National Park Ranger (1995)
- The Ranger Within:Exploring the National Park System with America's Best-known Ranger (1998)
- The Ranger's Guide to National Parks:The Official Guide to 59 America's National Parks (2004)
- The Great Smoky Mountains:Prírodovedný sprievodca (2007)
- The Yellowstone Reader (2011)
- The Grand Canyon:Prírodovedný sprievodca (2014)
- Yosemitský národný park:Prírodovedný sprievodca (2017)