Callum is Lead Data Scientist at Marks and Spencer, currently focussing on forecasting and supply chain analysis. He is leads both on operational data science projects and on developing the culture around analysis and the data science profession at the company. He previously worked in the Civil Service, setting up a data science function at the Department for Education to improve operational decisions around teacher supply. He is heavily involved with the wider data science and analytical community too, being a regular columnist for the Operational Research Society’s magazine, Inside OR; running introduction to coding courses; and supporting a range of startups in using data science to support businessdecisions.