Professor Silman is Director of the internationally renowned Arthritis Research Campaign's Epidemiology Research Unit and has considerable expertise in all aspects of epidemiological studies. He has achieved worldwide recognition in this field, has published over 300 papers and lectured widely. In addition he has taught on several courses on epidemiological methods and analysis both for those starting out research and those at a more advanced level. He is currently Vice Chairman of the Epidemiology and Health Sciences Research sub-panel for the United Kingdom's University research assessment exercise. DOB: 4.12.51. Professor Macfarlane holds the Chair in Epidemiology within the School of Epidemiology and Health Sciences at the University of Manchester. He was previously Senior Lecturer within the Arthritis Research Campaign's Epidemiology Unit also at the University of Manchester and Deputy Director of the Division of Epidemiology and Biostatistics at the European Institute of Oncology in Milan. He has authored approximately 100 peer-reviewed scientific articles, book chapters and reviews. He has lectured widely on Chronic Disease Epidemiology and taught on several courses.