This research has taken many twists and turns on its way into the book you are holding (or more likely reading from a screen). It began, in one sense, when I was very young—born in Canada into several diasporas, to New Zealand parents of English, Scottish and Māori heritage, who claimed citizenship by descent for me as an infant, and returned ‘home’ for my schooling. I became a migrant again as a twenty-something, travelling, working, and studying in Asia, and became intrigued by how many homelands were reaching out to emigrants like me. I won a scholarship to Oxford for doctoral study on that topic; it remained central to my later work on the Oxford Diasporas Programme, out of which this book eventually grew....