One of the most significant artists working today, Bridget Riley's dedication to the interaction of form and color has led to a continued exploration of perception. From the early 1960s, she has used elementary shapes such as lines, circles, curves, and squares to create visual experiences that actively engage the viewer, at times triggering optical sensations of vibration and movement. Her earliest black-and-white compositions offer impressions of several other pigments, while ensuing, multi-chromatic works present color as an active component. Although abstract, her practice is closely linked with nature, which she understands to be "the dynamism of visual forces-an event rather than an appearance."

Robert Kudielka is an art historian and former Professor of Aesthetics and Philosophy of Art at the University of the Arts, Berlin. He is the co-author with Bridget Riley of Paul Klee: The Nature of Creation, Works, 1914-1940 (2002) and author and editor of numerous books on Riley, including Robert Kudielka on Bridget Riley: Essays and interviews since 1972 (2005; revised and expanded edition, 2014) and The Eye's Mind: Bridget Riley, Collected Writings 1965-2009 (2009).

Paul Moorhouse is the 20th Century Curator at the National Portrait Gallery in London, where he is responsible for acquisitions, displays, and research relating to the collection within the period from 1914 to 1990. Since 2005, he has organized several exhibitions at the museum, including Pop Art Portraits (2007), Gerhard Richter Portraits (2009), and The Queen: Art and Image (2012). Recent publications include Pop Art Portraits (2007), Anthony Caro: Presence (2010), Bridget Riley: From Life (2010), and A Guide to Twentieth Century Portraits (2013).

Richard Shiff is the Effie Marie Cain Regents Chair in Art at The University of Texas at Austin, where he directs the Center for the Study of Modernism. His publications include Cézanne and the End of Impressionism (1984), Critical Terms for Art History (co-edited, 1996; second edition, 2003), Barnett Newman: A Catalogue Raisonné (co-authored, 2004), Doubt (2008), Between Sense and de Kooning (2011), and Ellsworth Kelly: New York Drawings 1954-1962 (2014), among others. For books published by David Zwirner, Shiff has contributed essays to Dan Flavin: Series and Progressions (2010) and Donald Judd (2011).