Charlotte Witt is Professor of Philosophy emeritusat the University of New Hampshire. Her most recent books include The Metaphysics of Gender (Oxford University Press, 2018), Feminist Metaphysics: Explorations in the Ontology of Sex, Gender, and the Self (Springer Publishing, 2010) , and (coedited with Sally Haslanger) Adoption Matters: Philosophical and Feminist Essays (Cornell University Press, 2005).