Eileen Costello has studied Marden's work closely over the past decade through numerous studio visits and discussions with the artist. She has contributed towards the production of a number of books and exhibition catalogues on the artist, and in 2003 initiated the catalogue raisonné of Marden's drawings and paintings. A specialist in post-war American and European art, she is also the Project Director for The Catalogue Raisonné of the Drawings of Jasper Johns, at The Menil Foundation, Houston.