Dr. Jimmy Walker is a scientific leader in water microbiology and decontamination at Public Health England (PHE) Porton. He has 29 years’ experience in public health microbiology with an extensive publication record and is regularly invited to present at national and international scientific conferences. Dr. Walker leads research projects for PHE and is particularly interested in the development of rapid detection technologies to assess the presence of opportunistic premise pathogens in water. He advises hospitals on incidents and outbreaks associated with waterborne pathogens such as Legionella, Pseudomonas and Mycobacteria. He works closely with the Department of Health (DH England) and Health and Safety Executive in writing and developing national and international guidance on the microbiology of water in healthcare. Dr. Walker also works with the DH on decontamination guidance in primary care dental practices, endoscopy and surgical instruments.