Book excerpt: Liberation and political theologies have emerged powerfully in recent years, interrupting the way in which First World Christians both experience and understand their faith. Through an analysis of the cultural and ecclesial contexts of these theological movements, as well as a critical examination of four of their principal exponents--Gustavo Gutierrez, Johann Baptist Metz, Jose Miguez Bonino, and Jurgen Moltmann--the author demonstrates that political and liberation theologies represent a new model of theology, one that proffers a vision of Christian witness as a praxis of solidarity with suffering persons.