Thomas Aubrey is one of the outstanding figures in Welsh Wesleyan Methodist history. He was first and foremost an eloquent and successful preacher, but he was hardly less successful as an administrator, despite the slight interest he had taken in circuit administration before 1854. He was instrumental in organizing meetings of officials of adjacent circuits to discuss the spiritual condition of the churches; in instituting revival meetings; in establishing the home mission fund of the North Wales district; in stimulating the erection of circuit manses; and, above all, in creating the North Wales district chapel fund — probably the greatest single act of statesmanship in the history of the denomination in the 19th cent. He also played an important part in defending the polity and doctrines of Welsh Wesleyan Methodism; he was staunch Protestant, though he took no active part in politics; and he was one of the first popular lecturers in Wales. He was not free from the criticism of some of his colleagues and church members for his inattention to correspondence, his indifference to punctuality, his limitations as a pastor, and his rather autocratic methods, but his great gifts as a preacher and as an administrator ensure him a high place among the leading figures of his denomination.