Personhood is considered at once a sign of legal-political status and of socio-cultural agency, synonymous with the rational individual, subject, or citizen. Yet, in an era of life-extending technologies, genetic engineering, corporate social responsibility, and smart technology, the definition of the person is neither benign nor uncontested. Boundaries that previously worked to secure our place in the social order are blurring as never before. What does it mean, then, to be a person in the twenty-first century?

In Impersonations, Sheryl N. Hamilton uses five different kinds...