Dr. Waller has been interested in the mechanisms that underlie disease processes even before starting his BSc at the University of Bristol. His work to develop novel anti-infective agents at British Biotech provided experience of bacterial genetics and early product development. These skills have been developed further during his work at the Animal Health Trust where his group have been responsible for the development and commercialisation of diagnostic tests that permit the eradication of Streptococcus equi from horse populations. The health and welfare benefits of his work were recognised by the British Horse Society in 2012 and the National Equine Forum in 2014. He continues to conduct new research and contract work with the pharmaceutical industry towards the development of new diagnostic tests and vaccines against S. equi and S. zooepidemicus.