He began his career at Korea Rail Network Authority in South Korea in 1995. and between 2011 and 2012, he studied for a master's degree in Railway Systems Engineering and Integration at the University of Birmingham, UK. He won the Best Technical Dissertation from the University of Birmingham for his dissertation. As a system engineer or a system integrator, he has participated in lots of railway projects - Western Sydney Airport (Australia), MRT-7 (Philippines), LRT1 (Indonesia), GTX-A (South Korea), National Rail Network (Saudi Arabia), Korea high-speed rail (South Korea), Bundang Metro (South Korea), etc. With his academic careers and vast experience of systems engineering in railway projects, he sometimes gives lectures on Systems Engineering while participating in several Systems Engineering projects. He prepared this book based on his railway experiences and academic careers to help railway Systems Engineering beginners.