Over the course of 20 years, my father gave a large number of lectures as a professor of mathematics at the University of Augsburg. Derived from his lecture notes was a notable textbook on "Gewöhnliche Differenzialgleichungen" ("Ordinary Differential Equations") that was published by Elsevier and has firmly established itself as a standard reference in German-speaking countries. I was able to assure myself of the high quality of this book during exam preparations for my mathematics minor, which formed part of my physics master degree examinations in 2006. The subject area of this exam included Ordinary Differential Equations, even though I did not attend any lecture on this subject! Within a few weeks, I worked through my father's textbook by way of self-study and passed the exam with flying colors.