**About the Special Issue Editors**

**Yongqiang Wang** currently serves as Director of Ion Beam Materials Laboratory and Team Leader for Radiation Science Experimental Team at Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA. He received his B.S. M.S. and Ph.D. in nuclear physics and technology from Lanzhou University in China. He has over 30 years of experience using energetic ion beams in materials research, including radiation damage effects, ion beam modification of materials, and ion beam analysis. He is a member of the International Committee for Ion Beam Analysis and a member of the Advisory Editorial Board for Nuclear Instruments and Methods in Physics Research: Beam Interactions with Materials and Atoms. He also co-chairs the Biennial International Conference Series on Application of Accelerators in Research and Industry. He has co-authored more than 350 publications, including two books: Handbook of Modern Ion Beam Materials Analysis (Second Edition) and Ion Beam Analysis: Fundamentals and Applications.

**Khalid Hattar** is a Principle Member of the Technical Staff in the Ion Beam Lab and Center for Integrated Nanotechnologies at Sandia National Laboratories in Albuquerque, New Mexico, USA. He received a B.S. in Chemical Engineering with an emphasis in Materials Science from the University of California, Santa Barbara, in 2003, and a Ph.D. in Materials Science and Engineering from the University of Illinois, Urbana-Champaign, in 2009 under the guidance of Professor Ian M. Robertson. He specializes in determining the property–microstructure relationship for a variety of structural and functional materials through in-situ electron microscopy techniques in various extreme environments, as well as tailoring local properties of materials through ion beam modification. He has co-authored more than 100 publications, including three book chapters.
