Xavier A. Harrison is a molecular ecologist at the University of Exeter. He is fascinated by the potential of host-associated microbes to drive variation among individuals in life history trajectory. He is co-founder of the British Ecological Society's Microbial Ecology Special Interest Group, alongside Rachael Antwis.

Michael J. Cox is a microbial ecologist at the University of Birmingham. His expertise is in applying microbial ecology techniques to understand the respiratory microbiome in chronic and acute respiratory diseases. He is an editor at FEMS Microbiology Letters and author of The Lung Microbiome (2019), a monograph for the European Respiratory Society.