Following his PhD, Klug moved to Birkbeck College in the University of London in late 1953, and started working with Rosalind Franklin in John Bernal's lab. This experience aroused a lifelong interest in the study of viruses, and during his time there he made discoveries in the structure of the tobacco mosaic virus. In 1962 he moved to the newly built Medical Research Council (MRC) Laboratory of Molecular Biology (LMB) in Cambridge. Over the following decade Klug used methods from X-ray diffraction, microscopy and structural modelling to develop crystallographic electron microscopy in which a sequence of two-dimensional images of crystals taken from different angles are combined to produce three-dimensional images of the target. In 1962 Klug was offered a teaching Fellowship at Peterhouse, Cambridge. He went on teaching after his Nobel Prize because he found the courses interesting and was later made an Honorary Fellow at the College.