If convicted , he could receive a fine and up to three years in prison , according to a statement released on behalf of the signers of the petition , who include Nicholas Serota , director of the Tate Gallery ; Alfred Pacquement , director of the Centre Georges Pompidou ; Robert Storr , dean of the Yale School of Art ; Ralph Rugoff , director of the Hayward Gallery in London ; Claire Hsu , executive director of the Asia Art Archive in Hong Kong ; and 12 others .