A metallurgical consultant in Fort Wayne, Indiana, USA Donald J. Wulpi studied and analysed failures of metal parts for more than 45 years. A graduate of Lehigh University, USA with a degree in metallurgical engineering, he spent most of his working life in several metallurgical laboratories of the International Harvester Co., now Navistar International Corporation. In retirement, Mr. Wulpi devoted himself to teaching the principles of failure analysis at the ASM International headquarters, in Materials Park, Ohio, USA and at various companies throughout the United States. He testified as an expert witness in product litigation cases for many years. Brett Miller is a metallurgical engineer with degrees from the Missouri University of Science and Technology, USA and the University of Wisconsin-Milwaukee, USA. He is a registered Professional Engineer in several states. For over 28 years Brett has worked as a failure analyst, metallurgist and expert witness, completing thousands of failure analysis investigations. He has authored numerous publications including book chapters and journal articles. Brett has been active in ASM International since 1984, and is a former chairman of the ASM Failure Analysis Committee. He is also active in NACE International and AWS. He has experience in aerospace, oilfield and commercial laboratories. Brett is currently the Technical Director at IMR Metallurgical Services in Louisville, Kentucky, USA.