He served for two ecclesiastical jurisdictions, first as the Vicar Apostolic of the Welsh District from 1840 to 1850, then as Bishop of Newport and Menevia from 1850 to 1880.
[4] Born in Bath, Somerset on 2 May 1796, Brown was ordained a priest of the Order of Saint Benedict on 12 March 1823.
Brown was appointed the Vicar Apostolic of the Welsh District and Titular Bishop of Apollonia on 5 June 1840.
He was consecrated to the Episcopate on 28 October 1840, the principal consecrator was Bishop Thomas Griffiths (Vicar Apostolic of the London District), and the principal co-consecrators were Bishop William Wareing (Vicar Apostolic of the Eastern District {of England}) and Bishop Bernard Collier (Vicar Apostolic of the Cape of Good Hope.
)[4] On the erection of the Catholic Hierarchy in England and Wales, the Welsh District was divided between the dioceses of Shrewsbury and Newport and Menevia.