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1 (of 11) Nobel Peace Prize Laureate Ellen Johnson Sirleaf with her Nobel diploma at the Nobel Peace Prize Award Ceremony in Oslo, Norway, 10 December 2011.

© The Nobel Foundation 2011 Photo: Ken Opprann

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2 (of 11) From left: Host Helen Mirren, Nobel Peace Prize Laureates Ellen Johnson Sirleaf, Leymah Gbowee and Tawakkol Karman, and artist Angélique Kidjo at the Nobel Peace Prize Concert at the Oslo Spektrum Arena on 11 December 2011.

© The Nobel Foundation 2011. Photo: Ken Opprann

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3 (of 11) Ellen Johnson Sirleaf autographs a chair at Bistro Nobel at the Nobel Museum in Stockholm, 12 December 2011.

© Scanpix 2011. Photo: Fredrik Sandberg/Scanpix

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4 (of 11) Nobel Peace Prize Laureates Ellen Johnson Sirleaf, Leymah Gbowee and Tawakkol Karman during their visit to the Nobel Museum in Stockholm, 12 December 2011.

Copyright © Scanpix 2011 Photo: Fredrik Sandberg/Scanpix

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5 (of 11) Eleven of the thirteen 2011 Nobel Laureates assembled for a group photo during their visit to the Nobel Foundation in Stockholm, 12 December 2011. Back row, left to right: Nobel Peace Prize Laureates Tawakkol Karman and Leymah Gbowee, Nobel Laureates in Physics Brian P. Schmidt, Saul Perlmutter and Adam G. Riess, Nobel Laureate in Chemistry Dan Shechtman and Nobel Laureate in Physiology or Medicine Bruce A. Beutler. Front row, left to right: Nobel Peace Prize Laureate Ellen Johnson Sirleaf, Laureate in Economic Sciences Christopher A. Sims, Nobel Laureate in Literature Tomas Tranströmer and Laureate in Economic Sciences Thomas J. Sargent.

© The Nobel Foundation 2011. Photo: Orasisfoto

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6 (of 11) 2011 Nobel Peace Prize Laureate Ellen Johnson Sirleaf, President of Liberia, during a state visit to Brazil, April 2010.

Photo: A. Cruz/ABr. Creative Commons License Attr. 2.5 Brazil

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7 (of 11) Ellen Johnson Sirleaf, President of Liberia, and Leymah Gbowee, two of the 2011 Nobel Peace Prize Laureates.

Copyright © Lyn Hughes, Global Fund for Women

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8 (of 11) Ellen Johnson Sirleaf, 24th President of Liberia.

Photo: Ministry of State for Presidential Affairs, Liberia Brazil

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9 (of 11) Ellen Johnson Sirleaf, President of Liberia, speaks at an United Nations event, on "Peace and Security through Women's Leadership: Acting on 1325 and Climate Change", September 2009.

Photo: UN Photo/Paulo Filgueiras

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10 (of 11) Ellen Johnson Sirleaf, President of Liberia, addresses the general debate of the sixty-fifth session of the General Assembly.

Photo: UN Photo/Rick Bajornas

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11 (of 11) Ellen Johnson Sirleaf, kicks a soccer ball to start of a "Sport for Peace" tournament, aimed at encouraging Liberians to embrace and use sport in promoting peace. Photo taken in Monrovia, Liberia, 2007.

Photo: UN Photo/Eric Kanalstein