Tom SteadmanTom Steadman Selective FilmographyJohn Carter(2012)Visual effectsLayout artist (Cinesite)Harry Potter and the Half-Blood Prince(2009)Visual effectsDigital effects artist: Double NegativeThe Dark Knight(2008)Visual effectsCg lighting artist: Double NegativeStardust(2007)Visual effectsMatch move artist: Double NegativeChildren of Men(2006)Visual effectsMatchmover (Double negative)(*) uncredited