Lewis began work at The Medical Toxicology Unit, London, in 2003. After returning to Loughborough University to complete his undergraduate degree, he returned to work a the MTU in 2005, before undertaking a formal four-year clinical scientist training programme and a part-time MSc degree specialising in analytical toxicology, during which time he moved to King’s College Hospital, London. He successfully completed the degree and training programme and now works as a registered clinical scientist at King’s College Hospital in the departments of clinical biochemistry and toxicology. He is involved with research and analytical method development/validation using HPLC, and LC-MS(/MS) for a range of toxicology- and biochemistry-related analytes. He has published reviews on LC-MS in analytical toxicology, the use of LC-MS in steroid analysis, the use of TurboFlow technology, and on the analysis