Dr Vyvyan Howard is Professor of Bioimaging, a medically-qualified toxico-pathologist and the current leader of the Nano Systems Research Group. From 2007 to 2009 he was the President of the International Society of Doctors for the Environment, an organisation representing some 30,000 medical doctors around the world which has WHO and UN recognition. He served on the DEFRA Advisory Committee on Pesticides from 2002-2008 as a toxicologist.