Portrait of Dr Anthony Del Genio, an American atmospheric scientist. Based at the Goddard Institute for Space Studies (GISS), Del Genio is one of the leading experts in global climate modelling. His main research interests are the dynamics of planetary atmospheres and in cloud parameters of general circulation models. His other interests have led to his inclusion in the Imaging Science Team for the Cassini Saturn Orbiter programme, and to his appointment as an interdisciplinary coinvestigator for the Earth Observing System (EOS) programme. Photographed at his office at GISS in 1991.