Prof. Yaguo Lei received the B.S. degree and the Ph.D. degree both in mechanical engineering from Xi’an Jiaotong University, P. R. China, in 2002 and 2007, respectively. He is currently a professor in mechanical engineering of Xi’an Jiaotong University, P. R. China. He ever worked at the University of Duisburg-Essen, Germany as an Alexander von Humboldt fellow and at the University of Alberta, Canada as a postdoctoral research fellow. He is also a fellow of IET and ISEAM, a senior member of IEEE, a member of ASME, and senior members of CMES, ORSC and CAA, respectively, and the associate editors/ the editorial board members of MSSP, IEEE TIE, NC&A, MST, etc. His research interests include health condition monitoring and intelligent maintenance, big-data era intelligent fault diagnostics and prognostics, reliability evaluation and remaining useful life prediction, mechanical signal analysis and processing, and mechanical system dynamic modeling. He has pioneered many signal processing techniques and intelligent models for diagnosing mechanical faults such as gearboxes, bearings, rotor systems etc. He has published 80 peer-reviewed papers on signal processing and fault diagnostics, which have been broadly cited by hundreds of researchers in this field.