This volume showcases emerging interdisciplinary scholarship that captures the complex ways in which biological knowledge is testing the nature and structure of legal personhood. Key questions include: What do the new biosciences do to our social, cultural, and legal conceptions of personhood? How does our legal apparatus incorporate new legitimations from the emerging biosciences into its knowledge system? And what kind of ethical, socio-political, and scientific consequences are attached to the establishment of such new legalities? The book examines these problems by looking at materialities, the posthuman, and the relational in the (un)making of legalities. Themes and topics include postgenomic research, gene editing, neuroscience, epigenetics, precision medicine, regenerative medicine, reproductive technologies, border technologies, and theoretical debates in legal theory on the relationship between persons, property, and rights.