**About the Special Issue Editors**

**Kanji Ono** received a B.Eng. from the Tokyo Institute of Technology and a Ph.D. in materials science from Northwestern University. After a year of postdoctoral research at Northwestern, he joined the faculty of the University of California, Los Angeles, where he became professor of engineering in 1976 and professor emeritus in 2005. He was awarded the HM Howe Medal by ASM International, the Achievement Award by ASNT, the Gold Medal Award by AEWG, and the Kishinoue Award by JSNDI. He is the author of more than 250 publications in materials science, acoustic emission, and non-destructive testing, and was the founding editor of *Journal of Acoustic Emission*. His areas of research have included physical metallurgy, strength and fracture of metallic and composite materials, non-destructive testing, and physical acoustics.

**Tomoki Shiotani** has worked on AE and relevant NDT for the evaluation of civil engineering materials and structures. After graduate study at Tokushima University, he conducted research at a general contractor, then moved to Kyoto University in 2007. In 2014, he founded the Laboratory on Innovative Technology for Infrastructure at Kyoto University, and was promoted to Professor. He has served as chair of AEWG, USA, and of Research and Technical Committee on AE in JSNDI, Japan, and organized International Symposium of AE twice (2008 and 2016) in Kyoto. He was a co-founder of International Institute of Innovative AE. He received Gold Medal of AEWG in 2019, and Best Paper Award of Structural Faults and Repair (Scotland, U.K.) four times.

**Martine Wevers**, Engineer in Metallurgy and Materials Engineering KU Leuven 1981, PhD in Science and Engineering KU Leuven 1987, is a full Professor at the KU Leuven and coordinating the research group "Materials Performance and Non-Destructive Evaluation" at the Department of Metallurgy and Materials Engineering. She is Chair of the Department of Materials Engineering. She is responsible for the NDT research (quality control, defect detection, development of new NDT techniques and data analysis procedures) and the research on the mechanical behavior of materials (fracture mechanics and fatigue). She specializes in in-situ or on-line damage monitoring techniques (acoustic emission, optical fibers, and sensors for structural health monitoring) and the evaluation of microstructural damage in materials using X-ray computed tomography.

**Marvin Hamstad** (Ph.D. ME/Solid Mechanics, University of California, Berkeley) has been continuously involved in acoustic emission research and applications since 1971. This AE work has ranged from nondestructive testing applications to materials characterization. He has worked in the field of composite materials since the 1970s. His various research efforts have resulted in more than 140 papers. From 1971 to 1984, he was at Lawrence Livermore National Laboratory. From 1984 to 2010, Dr. Hamstad was Professor of Engineering at the University of Denver. He is currently Professor Emeritus. Since 1992, Dr. Hamstad has held positions working on AE at the National Institute of Standards and Technology, Boulder, CO. He was chairman of the Committee on Acoustic Emission from Reinforced Plastics for 16 years, where he initiated the AECM international symposiums (1983–1998). Dr. Hamstad was an associate editor of *J. Structural Health Monitoring*, and currently serves as a co-editor of *JAE*.

