Patrick Geddes was a Scottish biologist, sociologist, geographer, philanthropist and pioneering town planner known as the "Father of Modern Town Planning". He introduced concepts like the "region" in architecture and planning. Geddes believed that a region influences and is influenced by the cities within it, represented by his "Geddian Trio" of activity, work, and place. He coined the term "conurbation" to describe merged cities and regions influenced by new transportation technologies. Some of Geddes' plans included the master plan for Tel Aviv which emphasized pedestrians, greenery, and civic spaces. He also developed the "constellation theory" of regional planning around groupings of interconnected cities.