John W. A. Rossen, PhD, MSc, has a 30-year history in molecular virology and microbiology, and more than 175 peer reviewed publications (H-index 37). He obtained his Master of Science in Molecular Cell Biology/Virology and a PhD in Molecular Veterinary Virology and Cell Biology. Currently, he is a talent track Professor for Medical Microbiology, in particular Personalised Microbiology, at the University of Groningen and head of the molecular unit which has successfully implemented the use of next generation sequencing for routine clinical microbiology and infection prevention. The method is used to determine the genetic relationship between pathogens (used to guide infection prevention measures) and for the molecular detection and further characterisation of (emerging) pathogens. This includes analyses for revealing (new) antibiotic resistance mechanisms and for determining the virulence of pathogens resulting in improved risk assessment and infection prevention. In addition, based on comparing whole genomes of bacteria, tailor-made diagnostic tests are developed used for specific detection of outbreak and/or virulent bacterial strains. Nowadays, his research group “Personalised Microbiology” focuses on implementing metagenomics and metatranscriptomics into clinical microbiology. These methods are not only applied to patient samples but also to animal-, food- and water samples. Apart from characterising the micro-organisms (including viruses) the interaction between them as well as with their host is studied. Prof. dr. Rossen is Chair of the ESCMID study group for Genomic and Molecular Diagnostics (ESGMD). From next year on he will join IDbyDNA to further set the standard for the identification and understanding of microorganisms and their role in human disease.