This book owes debt to many people who have influenced and helped my thinking on various aspects of it over the years. My interest in property in the body goes all the way back to my initial foray into bioethics and law as an undergraduate in the Centre for Social Ethics and Policy (CSEP) at the University of Manchester. I was introduced to questions relating to this, as well as to self-ownership and rights theories, by Charles Erin. This interest deepened later; when working at the CSEP I decided to do my PhD on the topic. Margot Brazier, John Harris, and Charles Erin supervised this, and I am indebted to them for their support and insights. I am also grateful for the initial encouragement of Graeme Laurie and Richard Ashcroft, who were my examiners, to continue to pursue this area of research in book form. This book builds on work started then. In the process of researching and writing the book, I came to see some of my earlier arguments as wrongheaded and in need of revision. This evolution in thinking is reflected in the book. As such, it contains ideas and arguments that readers might detect as having moved on from earlier published work.