Professor John Galloway is a Trustee at the Progress Educational Trust (PET) and a Volunteer Writer at its free weekly email news digest, commentary service and website BioNews, where he oversees the development of the BioNews glossary. He is Head of the Dental Team Studies Unit at the Eastman Dental Hospital, Expert Adviser to the Comprehensive Biomedical Research Centre (a partnership between University College London and the National Health Service's University College London Hospitals Foundation Trust), and an Associate of the Wellcome Trust's Centre for the History of Medicine. He is also Oral and Dental Lead for UK Biobank and for the National Institute for Health Research's Central and East London Comprehensive Clinical Research Network.

He originally studied Theoretical Physics at King's College London and at the University of Sheffield. He went on to posts at Nuffield College, Wolfson College and New College at the University of Oxford, and was Sir Henry Royce Research Fellow at the University of Manchester's School of Medicine. He has been Senior Administrative Officer at the Medical Research Council, Director of Public Affairs for the Cancer Research Campaign (now subsumed into Cancer Research UK), and Secretary to the Nuffield Foundation's Committee of Enquiry into the Education and Training of Personnel Auxiliary to Dentistry.