Over the years since 1886 many ministers and laymen including the Revd W. D. Killen (Professor of Church History at the Presbyterian College in Belfast), the Revd Dr C. H. Irwin, the Revd James McConnell, the Revd David Stewart, an editorial committee chaired by the Revd W. D. Baillie and the Revd R. Buick Knox have done a large amount of work in compiling and updating information relating to congregations in the Presbyterian Church. They, and a large number of others, deserve the thanks of people interested in tracing their ancestors as well as the thanks of those interested in the history of the Presbyterian Church.