Dr. Clarke is a lecturer in the Department of Psychiatry and Neurobehavioural Science and a Principal Investigator in APC Microbiome Ireland at University College Cork. His research interests include the impact of the gut microbiome on brain and behaviour across the life span, microbial regulation of tryptophan metabolism and translational biomarkers of stress-related neuropsychiatric disorders. With over 130 publications and a H-Index of 60, he was included in Clarivate Analytics Web of Science Group 2019 Highly Cited Researchers list. On Expertscape, he is listed at number 13 in the list of worldwide experts in the ‘Microbiota’ and at 39 in ‘Biodiversity’.