Shereen El Feki is a writer, broadcaster, and academic who started her professional life in medical science before going on to become an award-winning journalist with The Economist and a presenter with Al Jazeera English. She is the former vice-chair of the UN's Global Commission on HIV and the Law, as well as a TED Global Fellow. Shereen writes for a number of publications, among them The Huffington Post. With roots in Egypt and Wales, Shereen grew up in Canada; she now divides her time between London and Cairo. "Sex and the Citadel" is her first book. Learn more at www.sexandthecitadel.com.