Miller was educated at Trinity College, Dublin and ordained for Christ Church Derry in 1892. He was Rector of Donegal from 1894 to 1900. After a further incumbency at Raphoe he was Secretary of the Incorporated Society for Promoting Protestant Schools in Ireland until 1916.
He accompanied the Church of Ireland Archbishop of Dublin John Gregg and Protestant businessman Sir William Goulding "to see Michael Collins in May 1922, following the murders of thirteen Protestants in the Bandon valley, to ask whether the Protestant minority should stay on. Collins 'assured them that the government would maintain civil and religious liberty'."
- The Times Monday, Jun 28, 1920; pg. 13; Issue 42448; col C Irish Bishop On Partition”
- Handbook of British Chronology by Fryde, E. B;. Greenway, D.E; Porter, S; Roy, I: Cambridge, CUP, 1996, ISBN 0-521-56350-X, 9780521563505
- “Who was Who” 1897-1990 London, A & C Black, 1991 ISBN 0-7136-3457-X
- Malden Richard (ed) (1920). Crockford's Clerical Directory for 1920 (51st edn). London: The Field Press. p. 248.
- "The Clergy List, Clerical Guide and Ecclesiastical Directory" London, John Phillips, 1900
- "A New History of Ireland” by Theodore William Moody, F. X. Martin, Francis John Byrne, Art Cosgrove: Oxford, Oxford University Press, 1976 ISBN 0-19-821745-5
- The Times, Saturday, Mar 14, 1931; pg. 14; Issue 45771; col C Death Of The Bishop Of Cashel
- Bury, Robin (2017). Buried Lives - The Protestants of Southern Ireland. Dublin: The History Press Ireland. pp. 25, 120. ISBN 978 184588 880 0.
- citing McDowell, R.B. (1997). Crisis and Decline - The Fate of the Southern Unionists. Dublin: The Lilliput Press. p. 135. ISBN 1 874675929.