Arnon Bentur is Professor of Civil Engineering at the National Building Research Institute and Dean of the Faculty of Civil and Environmental Engineering at the Technion, Israel Institute of Technology, Haifa, Israel. He is the President Elect and Associate Editor of Materials and Structures (RILEM). Sidney Mindess is Professor Emeritus at the University of British Columbia, where he has taught in the Department of Civil Engineering since 1969. He hold a PhD from Standford University. His teaching and research interests are primarily in cement and concrete technology, with a particular interest in fibre reinforced concrete and the behaviour of concrete under impact loading. He has published extensively, and is engaged in consulting on concrete construction problems.