George was Chair of the Hammersmith Hospitals Research Ethics Committee from 2000-2010, and chair of the National Research Ethics Advisors’ Panel from 2009–20017. He was chair of the Gene Therapy Advisory Group in 2012, and continued as gene therapy advisor to the Health Research Authority. Between 2007-2017 he was a member of the Clinical Trials Expert Advisory Group for the Commission on Human Medicines and the MHRA, set up to scrutinize high risk clinical trials involving biological or similar agents.