This document discusses the history of social network analysis. It describes early precursors in the late 1800s including the work of Emile Durkheim and Ferdinand Tonnies. Formal social network analysis developed in the 1950s with kinship studies and urbanization studies. In the 1960s-1970s, scholars worked to combine different traditions, including groups centered around Harrison White at Harvard University and the work of Charles Tilly and Stanley Milgram.