Professor J.R. Leigh was educated at Sheffield City Grammar School and at Cambridge and London Universities from which he holds higher degrees in both Control Engineering and Pure Mathematics. He has worked in both small and large organisations on the development and application of control systems. Previous posts include Senior Systems Engineer - United Steel Companies, and Head, Control Systems Section - British Steel Corporation Engineering Laboratory. In his current appointment at the Polytechnic of Central London, his research and teaching interests are centred around the modelling and computer control of industrial processes. Among his recent publications are the books, 'Functional Analysis and Linear Control Theory' (Academic Press, 1980), and 'Applied Control Theory' (IEE Control Engineering Series, Number 18, 1982). He is a Fellow of the Institution of Electrical Engineers and a Member of its Computing and Control Divisional Board. He is a Fellow of the Institute of Mathematics and its Applications and a Member of the London Mathematical Society.