Stephen Neidle is an Emeritus Professor of Chemical Biology at University College London, where he has also been the Director of Research in the School of Pharmacy. He has published over 500 primary papers and reviews and is a principal inventor on 14 patent filings. He has also written and edited several books on nucleic acids and anti-cancer drugs.Mark Sanderson is a Visiting Professor of Biophysics in the Dept of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London. Recent structural studies in his laboratory have centred on type-II topoisomerase–DNA–drug complexes in collaboration with Prof. Mark Fisher's group at St. George's University of London using cryo-EM and X-ray crystallography, and the study of novel nucleic acid–protein complexes.