 While he was initially skeptical of Everett’s views, DeWitt became an ardent proponent of the many-worlds interpretation, a theory that DeWitt presented as the EWG interpretation of quantum mechanics after Everett, Wheeler, and DeWitt’s graduate student R. Neill Graham. In his description of the many-worlds interpretation DeWitt (1970) emphasized that its central feature was the metaphysical commitment to physically splitting worlds. DeWitt’s description subsequently became the most popular understanding of Everett’s theory. See Barrett (2011b) for further discussion of Everett’s attitude toward DeWitt and the many-worlds interpretation. See Lewis (2016) and Saunders, Barrett, Kent, and Wallace (eds) (2010) for discussions of recent formulations of the many-worlds interpretation. 