Sarah Mittlefehldt is an environmental historian and a professor in the Earth, Environmental & Geographical Sciences (EEGS) Department, at Northern Michigan University. She is the author of Tangled Roots: The Appalachian Trail and American Environmental Politics (2013), the definite study of the interconnections between environmental politics and the creation and eventual completion of the Appalachian Trail. Mittlefehldt completed the research for her book while thru-hiking the AT, stopping at trail club archives as she worked her way from Springer Mountain to Mount Katahdin.