Renwick was born in the isolated cottage of Maol-bhuidhe, in Kintail, Ross-shire. In March 1900 his wife is listed as living in
Manchester and several sources indicate he was also from there (probably
Chorlton-cum-Hardy). In the
First World War he served in the Royal Army Chaplains Department. He was professor of theology at
Edinburgh University and he was also a professor at the
Free Church College on the Mound in Edinburgh. In 1931 he was elected Moderator of the General Assembly of the Free Church of Scotland, succeeding Rev
Robert M. Knox. In 1957 at the time of his wife's death they were living at 19
Roseburn Cliff in western Edinburgh. He died in Lochgilphead on 5 February 1965, aged 76 and is buried in the
Grange Cemetery in the south of Edinburgh. The grave lies against the south wall in the south-west corner of the original cemetery near the link to the west extension. ==Family==