Both Herman and Brigitte Servatius obtained Ph.D. degrees from Syracuse University. Despite the fact that they entered their fifth decade of marriage, they have kept a bit of their individual mathematical identity. Herman’s interests are in geometry, algebra, and computer science, and Brigitte’s interests are in combinatorics and matroids. Their common interest is combinatorial group theory. Brigitte designed a discrete mathematics course at WPI (Worcester Polytechnic Institute, USA) for advanced mathematics students as an alternative to calculus back in 1987. It has grown into a popular course and is now cross-listed in mathematics and computer science. Discrete Mathematics developed over the many years of teaching the course at WPI to our (mostly) engineering students. Our next-generation coauthor ensures freshness.