'Mandela At 90' Imparts Secrets Of Leadership Former South African President Nelson Mandela celebrates his 90th birthday on Friday. A full program of events, including exhibitions, concerts and parties, is planned around the world.

'Mandela At 90' Imparts Secrets Of Leadership

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Nelson Mandela appears onstage during a concert in celebration of his life on June 27, 2008 in London, England. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

This week's issue of Time magazine pays tribute to revered leader Nelson Mandela with its cover story, "Mandela at 90: The Secrets of Leadership."

Managing Editor Richard Stengel, who wrote the piece — and spent over a year in South Africa working with Mandela on his autobiography, Long Walk to Freedom — talks about the political icon and Mandela's lessons of leadership.