Flock received theological training from St. Francis de Salles College Seminary, as well as from the Pontifical North American College and the Pontifical Gregorian University in Rome, where he received a degree in Biblical Theology.
[2] Flock arrived in Bolivia in 1988, where he began missionary work and priestly ministry in Santa Cruz.
[1][2][3][4] On November 4, 2016, Pope Francis appointed him as bishop of San Ignacio de Velasco.
Flock was consecrated bishop on January 17, 2013 by Tito Solari Capellari, S.D.B., archbishop of Cochabamba, in the Cathedral of San Sebastián.
[5][6] Flock has been a long-time critic of former President Morales and the wider Movement for Socialism accusing them of violence, racism, and dividing the country.