Ellen Johnson Sirleaf became the 24th president of Liberia in 2006. She won the 2005 elections and was re-elected in 2011. She, with Leymah Gbowee of Liberia and Tawakel Karman of Yemen, received the 2011 Nobel Peace Prize for their nonviolent work to help women. Educated in the United States, Sirleaf is the first elected female head of state of an African country. Her term of office ended January 22, 2018.