**About the Editors**

**Ronald W. Armstrong** Professor Emeritus Ronald W. Armstrong, University of Maryland, College Park, obtained a Bachelor of Engineering Science (B.E.S.) degree from Johns Hopkins University in 1955 and a Doctor of Philosophy (Ph.D.) degree in metallurgical engineering from Carnegie Institute of Technology, now within Carnegie-Mellon University, in 1958. He spent a post-doctoral year at the Houldsworth School of Applied Science, Leeds University, UK, during 1958–1959, followed by a Westinghouse Research Laboratory appointment during 1959–1964 and was then at the Commonwealth Scientific and Industrial Research Organization (CSIRO), Division of Tribophysics, University of Melbourne, Australia, during 1964. Tenured academic positions were at Brown University, 1965–1968, and the University of Maryland, College Park, 1968–1999. His sabbatical leave periods have been at the Physics and Engineering Laboratory (PEL), Department of Science and Industrial Research (DSIR), Lower Hutt, NZ, 1974; Department of Metallurgy and Materials Science, University of Cambridge, UK, 1984; Department of Physics, Cavendish Laboratory, University of Cambridge, UK, 1991. From 2000 to 2003, he was a Senior Scientist in the Munitions Directorate, Eglin Air Force Base, FL. He has held temporary positions with the U.S. Office of Naval Research, London, UK, during 1982–1984 and 1991 as a liaison scientist and at other overseas and U.S. universities and government laboratories. His research experience has mainly dealt with the dislocation mechanics of plasticity and fracturing in single crystal and polycrystalline materials.

**Wayne L. Elban** received a BChE with distinction in 1969 and a Ph.D. in Applied Sciences: Metallurgy in 1977 from the University of Delaware and a MS in Engineering Materials in 1972 from the University of Maryland, College Park. From 1969 to 1985, he was a research engineer at the Naval Surface Warfare Center, White Oak Laboratory, Silver Spring, Maryland. Since 1985, he has been in the engineering department at Loyola College (now Loyola University Maryland). In 2020, he retired as Professor Emeritus. He has worked on a variety of projects, including development and characterization of energetic materials, metallographic examination and hardness testing of historic wrought iron and synthesis and characterization of organic clay hybrids.
