When I first decided to undertake this project, the problem of exactly which subjects would be considered arose. I sidestepped this question with the non-answer "the kind of mathematics that my father does and enjoys". What a broad range that encompassed within combinatorics—latin squares, designs, groups of graphs, matchings, lattices, geometries, etc.—all linked together by the interests of one man. What links these papers in combinatorics together is more than that. They reflect his approaches to combinatorics and in their totality yield a way of looking at combinatorics. It is at the interface between geometry (especially finite geometries) and universal algebra where this approach lies.