More relevant to the HN crowd, he invented the general concept of a "pattern language" and described a set of patterns for architecture. The Gang of Four took

More relevant to the HN crowd, he invented the general concept of a "pattern language" and described a set of patterns for architecture. The Gang of Four took that concept, hunted down a set of patterns they found in software architecture, and wrote "Design Patterns: Elements of Reusable Object-Oriented Software" based on it, one of the most famous books in programming.