Kinnon MacKinnon leads the world’s largest study on people who stop or reverse their gender transitions, a group embroiled in intense political fights. Kinnon MacKinnon leads the world’s largest study on people who stop or reverse their gender transitions, a group embroiled in intense political fights. Transgender, Research, Gender, Youth, Hormones, Teenagers and Adolescence, Media, Testosterone, your-feed-healthcare NYT > Science