Bill McKibben is a founder of the environmental organization 350.org and was among the first to have warned of the dangers of global warming. He is the author of the bestsellers The End of Nature, Eaarth, and Deep Economy, as well as his recent hit, Falter. He is the Schumann Distinguished Scholar in Environmental Studies at Middlebury College and the winner of the Gandhi Prize, the Thomas Merton Prize, and the Right Livelihood Prize. He lives in Vermont.

For half the year, Stevie Lewis travels out of her van, furthering her passion for art and the outdoors. She is also an avid hiker and rock climber. After working for four years in animation she now illustrates children's books including Moon! Earth's Best Friend by Stacy McAnulty, Prince & Knight by Daniel Haack, Lost in the Library by Josh Funk, and Fatima's Great Outdoors by Ambreen Tariq. She currently lives in Northern Arizona where she lives with her partner and two dogs.