Leng Zhendong, PhD, is a research engineer of Research & Development Center at China Gezhouba Group Explosive Co. Ltd, Chongqiing, China. He obtained his Doctor Degree from Wuhan University, China, in 2017. His research covers fields of optimal use of explosives energy in rock fragmentation, blast vibrations, fragmentation control, and related areas. Dr. Leng has published 40 papers in refereed international and national journals.