Who was Nelson Mandela's partner in the firm long walk to freedom?

Nelson Mandela's partner in the autobiography "Long Walk to Freedom" is his co-author, Richard Stengel. Stengel, an American journalist and editor, collaborated with Mandela to capture his life story, detailing his experiences from childhood to his presidency in South Africa. The book offers profound insights into Mandela's thoughts on freedom, justice, and reconciliation.