Jon trained as a medical statistician, and has followed a career which has given him broad experience across health research through working as a statistical collaborator on a variety of health research projects. His major methodological contributions have been made in the fields of evidence synthesis and test evaluation.

He has published over 300 research papers, reviews in scientific journals and book chapters, which include both collaborative health research projects and methodological developments related to the evaluation of health care interventions and medical tests. His work has been funded by grants from the National Institute of Health Research and the Medical Research Council.

Jon’s current major focus is in test evaluation. He is the senior methodologist on numerous primary evaluations and systematic reviews of medical tests, leads the Cochrane Collaboration’s test evaluation activities, advises the WHO on test evaluation methods and is an NIHR Senior Investigator Emeritus. He is an enthusiastic teacher of statistics and research methods, and frequently runs workshops, particularly related to test evaluation, at local, national and international events.