- Suden varjo (2017)
- Jaguarin varjo (2018)
- Karhun varjo (2019)
- Shadow of the Fox (2021)
- Shadow of the Griffin (2023)
Tietokirjallisuus:
- The Making of a Ranger:Muistokirja kansallispuistonvartijasta (1995)
- The Ranger Within:Exploring the National Park System with America's Best-Known Ranger (1998)
- The Ranger's Guide to the National Parks:The Official Guide to American 59 National Parks (2004)
- The Great Smoky Mountains:A Natural History Guide (2007)
- The Yellowstone Reader (2011)
- The Grand Canyon:A Natural History Guide (2014)
- Yosemiten kansallispuisto:Luonnonhistoriallinen opas (2017)