This collection of original articles considers the perennial question 'What are persons?' It aims first of all to clarify the nature of the question and its relation to associated questions such as the nature of the human animal; how the concepts of human being, person, subject, and self are related; the persistence and unity of persons; and questions as to the conditions for personhood and personality. The 'dimensions' of the book's title reflects the volume's focus on the relations that persons have with themselves and each other.