David and Mary Thomson were Scottish immigrants from Westerkirk, Dumfrieshire, Scotland whom were the first official European settlers in what later became Scarborough, Ontario.
David Thomson (1760–1834) and Mary Glendenning Thomson (1767–1847) arrived in Upper Canada in 1796 landing in Newark, Upper Canada, then to York, Upper Canada. David Thomson worked as a stonemason, but in 1799 moved on to Scarborough by acquiring farmland. Thomson and his brother Archibald expanded their land holdings in Scarborough becoming one of the most important families in the area.
Descendents of the Thomsons' include the late Roy Thomson, 1st Baron Thomson of Fleet, his son Kenneth Thomson, 2nd Baron Thomson of Fleet and grandson David Thomson, 3rd Baron Thomson of Fleet.
The Thomsons' are buried at St. Andrew’s Presbyterian near their Thomson Settlement, now Thomson Memorial Park.