Susan Middleton is a photographer specializing in portraits of animals and plants. She is co-author of four books on the world's natural heritage, including Archipelago and Witness. She lives in San Francisco. Mary Ellen Hannibal is the author of Leaves & Pods (Abrams). Her writing has appeared in publications such as the San Francisco Chronicle, Esquire, and Elle. She is the founder of Evolve 2009 and lives in San Francisco.