This document provides an overview of the influential urban planner Sir Patrick Geddes and some of his key concepts. It discusses that Geddes introduced the concept of "region" to urban planning. He is known as the "father of modern urban planning" for linking sociological concepts to town planning. The document describes Geddes' concepts of the Geddesian triad of the organic relationship between the social, physical, and economical aspects of a city. It also explains Geddes' valley section model and his theories of conurbation and constellation, which looked at how multiple cities interact and connect within a region.