I use the techniques of X-ray crystallography and X-ray microscopy to study the structural biology of viruses. Viruses are attractive targets for study at the molecular level, since they are sufficiently simple that we may hope to achieve a rather complete understanding of their biology. In practice although their genomes are compact they display astonishing diversity, both in structure and function. Our attempts to relate structure to function have benefited from the developments in X-ray crystallographic methods that have brought very complex structures within reach of description in atomic detail. I am also responsible for the IR beamline at Diamond and am interested in the proliferation of correlative microscopy.