 He was Dean of Aberdeen in 1431, and was provided as Treasurer of the diocese of Glasgow sometime in 1431, but was not able to take up this position.However, he did become Provost of the Collegiate Church of Lincluden between 1434 and 1436.Winchester's services to the king were rewarded further in November 1435 when, after the death of Columba de Dunbar, he was elected as Bishop of Moray.