This book is an updated and lengthened version of the lectures that I gave in the Lauterpacht Centre for International Law in October 2016 as part of the Lauterpacht lecture series, which was founded in 1983 to celebrate the unique contribution to the development of public international law made by Sir Hersch Lauterpacht. In keeping with the lecture series, I sought connections between my work as a feminist international lawyer and that of Sir Hersch Lauterpacht in his long career as an academic and scholar, a barrister and judge at the International Court of Justice and, as recounted by Sir Robert Jennings, a ‘remarkable’ teacher.1 In the simplest, logistic terms, he was a lecturer at the London School of Economics prior to taking up his chair at Cambridge and he also lectured at the University of Michigan,2 both places where I hold academic appointments.