Anne Orth Epple (author) is the author of eleven books. She and her husband, Lewis Epple, spent five years photographing, researching, and writing about the 900 plants in this guide. Anne is a retired flower show judge, lecturer, and award-winning flower designer. They live in Mesa, Arizona. John Wiens (reviser) graduated college with a BS in Ag Science slanted heavily towards horticulture and botany. He has worked in the botany department at the Arizona-Sonora Desert Museum since 1985. He was involved in the creation of the Ironwood Forest National Monument in 2000. He has assisted in editing and has been published in multiple botanical books (such as Biodiversity, Ecosystems, and Conservation in Northern Mexico; Desert Gardens, a Photographic Tour of the Arizona-Sonora Desert Museum) and journals, including Madrono, Sonorensis, and The Plant Press. He lives in Tucson with his wife, Julie.