Ellen Johnson Sirleaf is a Liberian politician and economist who served as the 24th President of Liberia from 2006 to 2018. She was the first elected female head of state in Africa and is known for her efforts to promote peace, democracy, and women's rights in her country. Sirleaf played a significant role in rebuilding Liberia after years of civil war. In 2011, she was awarded the Nobel Peace Prize alongside two other women for their contributions to women's rights and peacebuilding. Sirleaf's leadership focused on economic development, education, and health care, aiming to improve the lives of the Liberian people and foster national unity.