Jonas Ranstam is an independent consultant in medical statistics who provides statistical services to investigators at universities, research organisations and private companies. He has been described as the World’s Most Prolific Peer Reviewer in Slate, STAT, The Scientist, and Scholastica. In 2016 Acquisition International named him the Statistical Consultant of the Year. Jonas Ranstam is affiliated with Lund University, Sweden, and is deputy editor of Osteoarthritis and Cartilage, statistical editor of the British Journal of Surgery, statistical consultant of Acta Orthopaedica, and a statistical reviewer for a large number of international scientific medical journals. He also maintains the Statistical Mistakes Blog, which focuses on systematic reviews of statistical mistakes in medical research and presents references to literature describing how to avoid such mistakes.