Bonnie Costello is William Fairfield Warren Distinguished Professor and professor of English at Boston University. Her many books include Marianne Moore: Imaginary Possessions, Elizabeth Bishop: Questions of Mastery, Shifting Ground: Reinventing Landscape in Modern American Poetry, and Planets on Tables: Poetry, Still Life, and the Turning World. She is general editor of The Selected Letters of Marianne Moore, and coeditor of Auden at Work.