Political scientist and awardwinning author Jonny Steinberg’s latest book, “Winnie and Nelson: Portrait of a Marriage,” provides a detailed account of the lives of Nelson Mandela and Winnie MadikizelaMandela, two of South Africa’s celebrated liberation leaders. Through extensive research, including interviews with approximately 150 people who knew the couple and an analysis of their letters, Steinberg offers a vivid portrait of a complex and historically significant relationship.