Dr. Tyson, Scientist Emeritus, has been the principal authority on fracture mechanics at the Materials Technology Laboratories of the Department of Natural Resources Canada in Ottawa since 1972. He graduated in Engineering Physics at the University of Toronto in 1961 and completed his doctorate in Metallurgy at the University of Cambridge in 1965. He taught physics at Trent University during its early years from 1967 to 1973, when he joined CANMET. He is the author of over 300 papers on mechanical properties of materials, concentrating on steels and on fracture mechanics. He is very active in research on fracture control in pipelines, and contributes to the pipeline materials subcommittee of the Canadian Standards Association. His current research focuses on low-constraint toughness testing and ductile crack arrest. Tyson is a Fellow of ASM International, and has received the Dofasco Award for Materials Engineering from CIM and the Canadian Metal Physics Medal.