Joanna HarperJoanna Harper is a medical physicist who has written extensively on gender and sport. She has been an expert advisor to many international sports federations, including the International Olympic Committee, on matters relating to gender variance and sort. Harper was an expert witness for the IAAF at both the Semenya and Chand trials before the Court of Arbitration for Sport. Harper has been racing at a relatively high level for over forty years—first in the men’s category, and for the last twelve years in the women’s category. Read More Read Less