Saint Robert, described as "gentle in companionship, merciful in judgment," studied in Paris and wrote a commentary--since lost--on the Psalms. After being ordained and serving as a parish priest in his native place, he was made rector of Gargrave. He then became a Benedictine at Whitby and joined a band of monks from Saint Mary's Abbey, York, to establish a monastery in which the strict Benedictine Rule would be revived. They settled, in the middle of winter in 1132, in the valley of Skeldale on land given to them by Archbishop Thurston.

The monastery became known at Fountains Abbey due to the presence of springs within its borders. The group became affiliated with the Cistercian reform, and the house became famous for the holiness and austerity of its members and its way of life. Robert was one of its most devout monks. The abbey became one of the centers of the White Monks in north England.

Impressed by the establishment, Ralph de Merly, Lord of Morpeth, built a Cistercian monastery on his own land, the Abbey of Newminster. In 1137 he brought 12 monks from Fountains Abbey and appointed Robert abbot. The monastery flourished under Robert's rule, and he established a house at Pipewell in Northamptonshire in 1143, one at Sawley and another at Roche in the West Riding.

He is said to have had supernatural gifts, and visions and encounters with demons have been attributed to him. He fasted so rigorously during Lent that a brother asked him in concern why he would not eat. He responded that he might eat some buttered oatcake, but once it was placed before him, fearing gluttony, he asked that it be given to the poor. A beautiful stranger at the gate took it--and the dish. While a brother was explaining the loss, the dish suddenly appeared on the table before the abbot. It was thought that the stranger was an angel.

Robert travelled to France again to see Saint Bernard, after he was slandered by some monks about his relations with a pious woman. Saint Bernard appears to have decided that the accusations were false. As a symbol of his belief in Robert's innocence, he gave him a girdle, which was kept at Newminster for performing cures.