In 1858 Hall became the associate pastor in Mary's Abbey, Dublin, joining Dr William B. Kirkpatrick. In 1861 he was appointed to the
Commissioners of National Education (Ireland), a secular government committee. From about 1862 he edited a monthly magazine called the
Evangelical Witness; this featured contributions from leading churchmen, and it became an influential publication. In 1862 wine merchant Alexander Findlater provided a site in Rutland Square (now
Parnell Square) plus the funding for a new Presbyterian church in Dublin. One condition was that John Hall be appointed as the head of the project committee. The new
Mary's Abbey was opened in 1864. In 1865 Hall became a
Doctor of Divinity when he was awarded an honorary degree by the American University of Washington and Jefferson; in later years he received further degrees from Columbia University and Trinity College Dublin. During his time in Dublin, Hall was the chaplain at
Mountjoy Female prison. He also devoted time to the various institutes for the orphans, the deaf and the blind. ==America==