Born in Buenos Aires on 15 October 1946, Ojea Quintana attended the seminary in his native diocese and earned a bachelor's degree in theology at the Catholic University of Argentina.

Beginning in 1994 he led the parish of Our Lady of Perpetual Help, one of the largest and most important in Buenos Aires.

He served several times as deacon of zone 2 of the diocese and assessor of the Christian Family Movement.

[3] He was elected to a three-year term as president of the Argentine Bishops Conference in the fall of 2017[4][5] and has been re-elected.

On 8 March 2018, Pope Francis named him a member of the council of 18 bishops charged with preparing the Synod on the Amazon in 2019.