Yehuda Dayan is Head of Data Science at Citigroup inc, Global Data Insights unit. Dr. Dayan joined the firm in 2014, and previously co-headed Citigroup’s Research Innovation Lab. Yehuda has been a data scientist and statistician for over 10 years, consulting on numerous political and marketing campaigns, audience measurement and estimation problems. He has a PhD. and MSc. in Statistics from the London School of Economics, a BSc. in Statistics and Economics from Tel Aviv University. Located in London, he is a Royal Statistical Society Fellow.