Linton Freeman

Linton Freeman is an American sociologist and one of the foundational figures in social network analysis. He is best known for introducing the concept of betweenness centrality in 1977, providing a mathematical measure of how much a node in a network mediates the flow between other nodes. Freeman's work established centrality as a family of measures — including degree, closeness, and betweenness — rather than a single property, and his 1979 paper "Centrality in Social Networks: Conceptual Clarification" remains one of the most cited works in the field.

Freeman's contribution was not merely technical. By formalizing the intuition that power in networks comes from position as well as from connections, he gave sociologists a tool for studying brokerage, gatekeeping, and structural inequality in empirical networks. His work bridged graph theory and sociology, creating the interdisciplinary field that would later become network science.

Freeman's betweenness centrality remains a cornerstone of network analysis, though it has been extended, critiqued, and refined by subsequent work on random walk betweenness centrality, flow betweenness centrality, and other variants.