As well as his role at Reading Glenn is also a Visiting Professor at Imperial College, London (Institute for Global Health Innovation) and Northumbria University in addition to honorary positions at research institutes in New Zealand and China. He currently researches acute and chronic gut disease. Specific projects on pro/prebiotics, gas production, gut microbiota development with age, gastroenteritis, obesity and colonic homeostasis are being carried out. Human trials are a major facet of the research, with initial principles being tested in gut models. He is an author of 8 books, >490 research papers, >70 PhD students (some co-supervised); >130 research contracts. His PhD was on the bacteriology of sediments and was awarded by University of Dundee. He then had research positions at MRC Dunn in Cambridge and Institute of Food Research in Reading.