Nathan Guest is Head of Energy Purchasing for Imerys. Senior Manager with Imerys for over 15 years with experience in Energy Management, Global Purchasing, Logistics and Supply Chain management. The world leader in mineral-based specialties for industry, Imerys transforms a large variety of minerals into high value specialty products for the industry using sophisticated technical processes. Imerys has operations in 50 countries, with more than 16,000 employees across 250 industrial sites. Key contact with energy suppliers and leading contractual negotiations, whilst implementing energy strategies and risk management. Driving the direction of strategic decisions concerning energy and responsible for maintaining, and improving the service quality achieved, with cost reduction across the energy category. Member of the Institute of Chartered Shipbrokers (MICS) & Member of the Chartered Institute of Purchasing & Supply (CIPS).