Dr. Andrew Williams is External Relations Officer at the European Southern Observatory (ESO) - an intergovernmental organisation of 16 Member States that constructs and operates world-leading astronomical facilities and fosters international cooperation. Dr Williams supports strategic relationships with current and future Member States, the European Union, and international organisations such as the UN. He represents ESO at the UN Committee on the Peaceful Uses of Outer Space, and recently has been dealing with the policy aspects of the impact of satellite constellations on astronomy. Prior to ESO he worked as senior policy advisor for NATO and as a physicist for the UK government. He holds a masters degree in physics and doctorate in public policy.