The modern professional world of international adjudication bears little trace of the ‘invisible college’ theorized by Oscar Schachter 50 years go. Instead, it has become a social field marked by a fierce competition among actors possessing unequal skills and influence. Moving from these premises, this article unravels the socio-professional dynamics of the community of legal experts – judges, arbitrators, government agents, private counsel, court bureaucrats, specialized academics, etc. – dealing with the judicial settlement of international disputes on a daily basis. On the one hand, the community has developed a specific set of social structures, practices, and dispositions that distinguish it from the rest of the international legal profession and insulate its activities from outside interference. On the other, it is the site of an endless struggle among its participants, who deploy various forms of capital to consolidate their positions relative to one another. Having outlined the twofold structure of the community – externally autonomous and internally conflictive – the article reflects on how co-operation and competition affect the everyday unfolding of international judicial proceedings and the production of legal outcomes at the international level.