Ricky Metaxas is a Teaching Fellow at the University Engineering Department and Fellow of St John's College, Cambridge. He received a BSc in Electrical Engineering and a PhD in Physics in 1968 from Imperial College, London, for work on two stage ionisation phenomena in radio frequency discharges. In 1968 he joined the Department of Physics at the University College of Swansea, Wales, as a Post-Doctoral Fellow where he worked on problems related to fusion reactors. Between 1972 and 1982 he was a member of the Electrophysics Group of the Electricity Council Research Centre, England, where he specialised in industrial applications of radio frequency and microwave energy. Since 1982 Dr Metaxas has been teaching topics related to energy utilisation and electroheat. In 1986 he was the recipient of the Outstanding Paper Award from the International Microwave Power Institute for the most significant contribution to the Journal of Microwave Power during 1985. Roger Meredith is Managing Director of APV-Magnetronics Ltd, a wholly owned subsidiary of APV Baker plc. He graduated from the University of Bristol in 1951 in Electrical Engineering. After a graduate apprenticeship with the former British Thomson Houston Co (now GEC) he joined the electronic engineering department and worked on microwave systems and transmitters for radio and communications and industrial heating for fifteen years. In 1968 he formed Magnetronics Ltd, to specialise in industrial applications of microwave energy.