Julian Higgins is professor of evidence synthesis in the School of Social and Community Medicine at the University of Bristol, UK. His research interests are primarily in methodology of systematic reviews and statistical combination of evidence across studies. Interests include: assessing and adjusting for bias in primary studies; meta-epidemiology; meta-analysis methods including investigating heterogeneity, Bayesian approaches, network meta-analysis and analyzing individual participant data; and modernizing research synthesis approaches. He is an active contributor to Cochrane, and has been co-editor of the Cochrane Handbook for Systematic Reviews of Interventions since 2003. He is co-author of the Wiley textbook Introduction to Meta-analysis.