Gareth O. Roberts is Professor at the statistical department of the University of Warwick, and he is Director of the Center for Research in Statistical Methodology in Warwick. He is a major contributor to the theory and methodology of MCMC and related methods, with application in statistics. He is also interested in stochastic simulation, and statistical inference for infectious diseases. He has been Editor in Chief of JRSS-B. He has received many awards, including the Rollo Davidson Prize, the Institute of Mathematical Statistics Medallion, the Wolfson Research Merit Award and he is Fellow of the Royal Society of UK.