In July 1919, Long returned to his diocese, where he continued his involvement with education. He restarted All Saints College in Bathurst on a new site, and opened the Marsden School for Girls at Kelso. Long was grand chaplain of the United Grand Lodge from 1923 to 1926. He drafted a new constitution for the Church of England in Australia, making it independent of the church in Britain, and advocated the White Australia Policy. Long was elected Bishop of Newcastle in December 1927 and was enthroned on 1 May 1928.