If you are interested in the experiences of Bill Gates, Thomas Edison, or Soichiro Honda as an engineer, you can easily find the information by searching the web. However, there must be many other engineers in the world who have made endless efforts in addition to such well-known engineers. And each of them must have a unique and precious experience. If you wanted to know more about the experiences of these engineers, how would you go about finding out about them? When I thought about the answer to this question, I could not find an easy way to get that information. Imagine this. If you are a newcomer to the world of engineering, don't you think that if you can hear in advance about the most successful and most unsuccessful experiences of engineers who have had a variety of careers, you will be able to make great use of them in your own career? If you are a young engineer in the middle of your growth, don't you want to learn from your predecessors to further improve your skills and accelerate your work in the future? If you are a veteran engineer, wouldn't you like to take some time to compare your past experiences and appreciate your own efforts and those of other engineers, even if only indirectly? I had a strong desire to learn about the most successful and most unsuccessful experiences of "unknown" engineers who were not readily available in the search results. In this book, we have interviewed engineers (with their permission) about their successes and failures in all kinds of technical fields, from newcomers to veterans, to create a collection of useful information that we can share with you. In addition to paying the engineers for their experiences and efforts, we also interviewed them with our own money, and ordered the work of a designer to ensure that we do not treat their soulful experiences carelessly. In order to pay respect to the engineers as well as to avoid treating the soulful experience carelessly, we ordered a designer to help us with the binding and design. I hope this will be of some help to you in your career. October 01, 2021 KASATA