Ralf is Director of Machine Learning at Amazon Berlin, Germany. In 2011, he worked at Facebook leading the Unified Ranking and Allocation team. From 2009 to 2011, he was Director of Microsoft's Future Social Experiences (FUSE) Lab UK working on the development of computational intelligence technologies on large online data collections. He holds both a diploma degree in Computer Science in 1997 and a Ph.D. degree in Statistics in 2000 from TU berlin. Ralf's research interests include Bayesian inference and decision making, computer games, kernel methods and statistical learning theory.