Christopher Riopelle is curator of post-1800 paintings and Allison Goudie is Harry M. Weinrebe Curatorial Assistant, both at the National Gallery, London. Tim Bonyhady is an Australian lawyer, cultural historian, and author. Sarah Thomas is lecturer in the art of the 19th century, Birkbeck College, University of London. Alex J. Taylor is assistant professor of history of art and architecture, University of Pittsburgh. Wayne Tunnicliffe is head of Australian art at the Art Gallery of New South Wales, Sydney.