When the Juli Prelature celebrated its Golden Jubilee in Peru in 2007, Maryknoll’s three leadership groups wrote an open letter to the Peruvians and Maryknollers who had worked together.

"It has been a privilege and a joy for Maryknoll to work alongside the Aymara, Quechua and mestizo people of Juli. The fruit of the pastoral activity of many priests, Brothers, Sisters and lay missioners who dedicated large parts of their lives to work in the Peruvian Altiplano, is seen today in the beautiful and well prepared Christian community of the Juli Prelature."

Maryknoll Sisters joined in thanksgiving for working in the institute of rural education, the radio school, co-ops, training catechists and health promoters, living and working among the indigenous people of the highlands. The first two Maryknoll Sisters arrived in Peru in 1951, invited by Maryknoll Father John Lawler to begin the first parochial school, Santa Rosa de Lima, a bilingual grammar and high school. A Sister social worker directed the parish social service center and she and another Sister promoted Family and Community Services within the archdiocesan welfare program of Caritas of Lima.

Two Sisters worked in Ciudad de Dios where four thousand destitute Peruvians set up their tents in a desert area. Varied ministries continued in Lima, Arequipa, Tacna, Ica, Puno and other towns in the highlands. Liberation theology was born in Peru under the leadership of the respected theologian, Father Gustavo Gutiérrez who described it as speaking about God starting from the situation of the poor in history.

Maryknoll Sisters' ministries with the poor gave priority to the pastoral formation of lay people to participate in the Church as a right and responsibility; accompaniment of  prostitutes, people suffering trauma from violent situations, people with HIV/AIDS; alternative health treatment; basic Christian communities; issues of Justice and Peace, human rights, human dignity.