R. Keith Mobley in my honest and humble opinion is probably one of the prophets on reliability and maintenance and has written more than 20+++ books on this subject. I am lucky that he is one of my connection on Linkedin and consider him as a dear and wonderful friend. 50 years of combined business, finance, engineering and consulting experience. He is one of the main Principal Consultant of Life Cycle Engineering, Inc. He have written 25 textbooks including McGraw-Hill's Maintenance Engineering Handbook and Elsevier's Plant Engineering Handbook, Total Plant Performance Management, as well as a comprehensive plant engineering book series.