A breathtaking dive into the saga of transgender and intersex athletes: gripping and accurate. -- Stéphane Bermon, director, IAAF Health & Science Department There is no more complex issue facing sport than that of sex vs gender. Drawing on both experience and extensive research, Harper weaves the complex science and biology of testosterone, performance, DSDs, and transgender athletes into an historical narrative full of fascinating characters and concepts that have vexed authorities for decades. There may be no solution that satisfies all stakeholders involved in this issue, but Harper presents all the elements necessary to have an informed discussion, whatever your position. Much work remains to be done, evidence to be gathered, but Harper is at the forefront of that exploration, and this book will arm anyone who wishes to engage with as much knowledge as they can possibly have to make a constructive contribution to a fascinating debate. -- Ross Tucker, sports scientist, The Science of Sport Sporting Gender brings you behind the dramatic scenes of the rule-making world of sports. A must-read for re-framing the concepts of fairness and gender in athletic competitions. -- Eric Vilain, M.D., Ph.D, geneticist, International Olympic Committee advisor and expert witness for Caster Semenya before the Court of Arbitration of Sports, on the opposite side of the author, Joanna Harper Since Joanna Harper did this great study about transgender and intersex people we all can inspire young people outside of the courtroom. -- Tifanny Abreu, transgender Brazilian professional volleyball player