Billy Collins is Distinguished Professor of English at Lehman College and the author of eight books of poetry, including Ballistics, The Trouble with Poetry: and Other Poems, Nine Horses, Sailing Alone Around the World, and Questions About Angels, which was selected by Edward Hirsch for the National Poetry Series. He has received fellowships from the New York Foundation for the Arts, the National Endowment for the Arts, and the Guggenheim Foundation, and has served two terms as the poet laureate of the United States, along with one term as New York State Poet. Collins divides his time between New York and Winter Park, Florida.

David Allen Sibley has spent most of his life traveling across North America, studying and drawing the natural world. With the National Audubon Society, he published The Sibley Guide to Birds in 2004 and The Sibley Guide to Trees in 2009. He lives with his family in Concord, Massachusetts, and his work can be viewed at www.sibleyguides.com.