She was born and raised in Anchorage, Alaska, where she still lives part of the time. Her father, John "Jack" Roderick, a Yale football star, was mayor of the Greater Anchorage Area Borough, and her late mother, Martha, was a renowned Alaska educator. Libby graduated summa cum laude from Yale University in American Studies, and has worked as a TV and print news reporter, radio consultant, nuclear weapons educator and writer on Alaska Native issues.
Libby is also the cousin of John Roderick, Seattle-based podcaster and singer/songwriter.