[3] Born at Cullen House, Moray, Scotland, he was educated at Westminster School and Christ's College, Cambridge.
[4] Grant succeeded his father as Member of Parliament for Elginshire in 1761, a seat he held until 1768.
In 1783 he was a co-founder of the Royal Society of Edinburgh and served as its first Physical President.
[6] He died at the family seat of Castle Grant in February 1811, aged 72, and was succeeded by his son Ludovick Alexander Grant, who later that year succeeded his second cousin as fifth Earl of Seafield.
His sister, Penuel Grant, married the Scottish author, Henry Mackenzie.