Paul is the Head of Food Biosciences at Teagasc, is a Principal Investigator with the large Irish Research Centres, APC Microbiome Ireland, VistaMilk and Food for Health Ireland and Head of Microbiology / Co-Founder of SeqBiome Ltd.. He is a molecular microbiologist, with a particular focus on the microbiology of foods (especially fermented foods), the food systems and of humans (especially athletes), as well as probiotics and postbiotics. He is the author of >450 peer-reviewed publications.