Chris Riddell, is an award-winning children’s illustrator and author as well as long-term political cartoonist for the Observer. He served as 2015-2017 UK Waterstone's Children's Laureate. His books have won a number of major prizes, including the 2001, 2004 and 2016 CILIP Kate Greenaway Medals. Goth Girl and the Ghost of a Mouse won the Costa Children's Book Award 2013. His work for Macmillan also includes the bestselling Ottoline books, The Emperor of Absurdia, and, with Paul Stewart, the Muddle Earth books, the Scavenger series and the Blobheads series. Chris has been honoured with an OBE in recognition of his illustration and charity work. He lives in Brighton with his family.

_{Photo Credit: Macmillan Children's Books}

Martin Royalton-Kisch is a former Senior Curator of the Department of Prints and Drawings at the British Museum. He has written and lectured widely on European art by the old masters, organising exhibitions of these. He has also written about modern and contemporary art, in which he has a keen interest. His publications include Old Master Drawings from the Malcolm Collection (1996), and The Light of Nature: Landscape Drawings and Watercolours by Van Dyck and his Contemporaries (1999). He is currently compiling a complete catalogue of Rembrandt’s known drawings (www.rembrandtcatalogue.net).

Sir Nicholas Penny was Director of the National Gallery, London from 2008 to 2015.  Other positions have included lecturer in art history at the University of Manchester, Keeper of the Department of Western Art at the Ashmolean Museum in Oxford, Clore Curator of Renaissance Painting at the National Gallery London, and Senior Curator of Sculpture and Decorative Arts at the National Gallery of Art, Washington. He is the author of many books and articles on both painting and sculpture, including The Materials of Sculpture, Taste and the Antique (with Francis Haskell) and Raphael (with Roger Jones).