“…The life and work of Orlando Fals Borda (1925–2008), one of Latin America’s most renowned and influential thinkers of the second half of the past century and cofounder of participatory action research, continues to be of keen interest to scholars across myriad disciplines. Yet despite the consensus that both his Presbyterian upbringing and his friendship with the Catholic priest and revolutionary Camilo Torres strongly influenced his thinking and writing (Cataño et al, 1987; Cendales, Torres, and Torres, 2005; Pereira, 2008; Restrepo, 2008; Suárez, 2017), the question of how and to what extent his intellectual career was influenced by his involvement in Christian progressive thinking has only recently begun to receive scholarly attention (Perez Benavides, 2010; Poggi, 2015; Moreno, 2017; Díaz, 2018). Seeking to contribute to this growing body of work and drawing on his early works as well as on letters and unpublished writings across four archives, i this article centrally argues that Christian ethical and theological concerns are a major but underappreciated contribution to Fals Borda’s ideas about social change.…”