[1] One of his major works, Popular Religion and Capitalist Modernization in Latin America (Orbis), has been published in several editions, including translations into English and Portuguese.
In addition he has lectured in Research Methodology in the Academia Diplomática de Chile (2004–2012) and the Master's program in Military History and Strategic Thought of the War Academy of the Chilean Army (2004–2015).
[10][11] According to the Italian sociologist Roberto Cipriani, Parker's work analyzes with scientific rigor the relations and intersections between popular and official religion.
[15] During the dictatorship of General Augusto Pinochet, Parker supported ecumenical initiatives for human rights and a restoration of democracy in Chile.
He was president of the Association of Catholic Students (1974–1976), and as executive secretary of the Lay Department of the Chilean Episcopal Conference (1977–1981) he worked with bishops including Cardenal Raúl Silva Henríquez, Bernardino Piñera, Fernando Ariztía and Enrique Alvear.
While in Europe studying at Louvain (1982–1985), he took part in political activities seeking socialist reconstruction and involvement of the churches with Chilean exiles overseas.
On returning to Chile he engaged again with the defense of human rights, and assisted church grassroots communities in their struggles under the inspiration of Liberation Theology.
25 p. ISBN 999266567X 2000 Los jóvenes chilenos, cambios culturales; perspectivas para el siglo XXI, Santiago: MIDEPLAN.
120 p. 1996 Otra Lógica en América latina, Religión popular y modernización capitalista, México and Santiago: Fondo de Cultura Económica.
163 p. 2015 “" Religion et transition énergétique: une étude en Amérique du Sud" Social Compass, Vol, 62, N°3, September, pp. 344–361.
En B. Hogenboom, M Baud, F de Castro, (editores) Gobernanza Ambiental en América Latina, Clacso - Engov: Buenos Aires (see paper on line) 2013 “Elites, Climate Change and Agency in a Developing Society: the Chilean Case”, Environment, Development and Sustainability, Vol 15, Nº5, pp. 1337–1363.
(See paper on line) 2006, “Magico-popular religion' in contemporary society: towards a post-western sociology of religión”, en James A. Beckford, and John Walliss (eds.)