The Most Reverend Desmond Tutu is a South African social rights activist and retired Anglican bishop who rose to worldwide fame during the 1980s as an opponent of apartheid. Tutu's admirers see him as a man who since the demise of apartheid in South Africa has been active in the defense of human rights and uses his high profile to campaign for the oppressed.
He has campaigned to fight AIDS, tuberculosis, poverty, racism, sexism, the imprisonment of Chelsea Manning, homophobia and transphobia. He received the Nobel Peace Prize in 1984; the Albert Schweitzer Prize for Humanitarianism in 1986; the Pacem in Terris Award in 1987; the Sydney Peace Prize in 1999; the Gandhi Peace Prize in 2007; and the Presidential Medal of Freedom in 2009.
Most of the above from the man's Wikipedia entry.