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Scholars have often assessed and criticized the group of international arbitration professionals, some characterizing this group as a dense ‘white, male’ group. Faced with limited access and data, however, this critique has not been informed by a robust empirical component. Relying on all the appointments made in proceedings under ICSID between 1972 and February 2014, interviews with arbitration professionals, and an original database created for this project, this article is the first to assess the social structure of investor–state arbitrators. Using network analytics, a long-standing but recently popularized methodology for understanding social groups, the article maps the group of professionals by relying on formal appointments to tribunals. The subsequent analysis of this form of operationalizing the social group reveals who are the ‘grand old men’ (and formidable women) or ‘power-brokers’ that dominate …