Jason Williams manages the language understanding group for Siri, at Apple. Before joining Apple, he was a Research Manager at Microsoft Research, where he led the Conversational Systems Research Group and the Redmond Reinforcement Learning Group. Prior to Microsoft, he was Principal Researcher with AT&T Labs – Research. He has published about 60 peer-reviewed papers on dialog systems and related areas, and has received five best paper/presentation awards for work on statistical approaches to dialog systems, including the use of POMDPs (partially observable Markov decision processes), reinforcement learning, turn-taking, and empirical user studies. In 2012 he initiated the Dialog State Tracking Challenge series, in 2014 he shipped components of the first release of Microsoft Cortana, in 2015 he launched Microsoft’s Language Understanding Service, and in 2018 he launched Microsoft’s Conversation Learner Service. He is President of SIGDIAL, and an elected member of the IEEE Speech and Language Technical Committee (SLTC) in the area of spoken dialogue systems.