Charles is a leading specialist in concrete engineering and construction materials with over 45 years experience. His experience includes the use of concrete for civil, building and tunnelling applications. After a number of years working in the construction chemicals industry in Hong Kong, Singapore and Dubai, in 2000 he was appointed of Managing Director of the International Centre for Geotechnics and Underground Construction based in Zurich, a foundation responsible for the training and qualification of staff for tunnelling projects. More recently, Charles has been involved as a consultant to a number of different organisations within the civil engineering and tunnelling sectors and has recently been advising joint venture contractors on the Deep Tunnel Sewer System, Phase 2 project in Singapore, the Central Interceptor Tunnel in Auckland, New Zealand, the Sydney Metro to West Sydney Airport railway, Australia and the Thames Tideway project Charles is a fellow of the Concrete Society and a member of the Institute of Concrete Technology.