Gustavo Gutiérrez (born 1928) is a Peruvian Dominican Priest, and one of the founders of liberation theology.
Significant Books:
Theology of Liberation: History, Politics, and Salvation by 
We Drink from Our Own Wells: The Spiritual Journey of a People by Finding Aids:
Leonardo Boff (born 1938) is a Brazilian theologian and former Franciscan priest.
Significant Books:
Cry of the Earth, Cry of the Poor by 
Introducing Liberation Theology by 
Jesus Christ Liberator by Finding Aids:
Jon Sobrino (born 1938) is a Spanish Jesuit priest who worked in El Salvador.
Significant Books:
No Salvation Outside the Poor: Prophetic-Utopian Essays by 
Jesus the Liberator by Finding Aids:
José Míguez Bonino (1924-2012) was an Argentine theologian in the Methodist tradition, educated in the United States at Candler School of Theology and Union Theological Seminary. He was active in the ecumenism movement and in Argentine politics.
Significant Books:
Doing Theology in a Revolutionary Situation by 
Toward a Christian Political Ethics by 
Faces of Latin American Protestantism by Finding Aid:
Juan Luis Segundo (1925-1996) was an Uruguayan Jesuit priest.
Significant Books:
The Liberation of Theology by 
The Historical Jesus of the Synoptics by Finding Aids: