He was son of George Logan of Ayrshire, by his wife, a daughter of Rev John Cunningham, minister of Old Cumnock.
[1] He was successively minister of Lauder, Berwickshire, 1707; Sprouston, Roxburghshire, 1718; Dunbar, East Lothian, 1721; and Trinity College Church, Edinburgh, 1732.
[2] On 8 May 1740 he was elected by a large majority Moderator of the General Assembly of the Church of Scotland, and in that capacity solemnly deposed Ebenezer Erskine and seven other seceding brethren a week later.
[1] He strenuously supported the Hanoverian accession, and on the approach of the Jacobite army towards Edinburgh in 1745, was a warm but unsuccessful advocate for placing it in a state of defence.
[1] His views on hereditary right involved him in a lively contest with Thomas Ruddiman, George Mackenzie, 3rd Earl of Cromartie, John Sage, and other prominent Jacobites.