His family were all Glasites, an independent Christian sect, founded by one of their ancestors and sometimes called Sandemanians.
He was born on 28 June 1757 in Perth, Scotland[1] the son of George Sandeman of Springland (1724-1803) and his wife, Jean Duncan of Seaside.
[3] In 1798 David left the company to found the Commercial Bank of Scotland.
Between 1805 and 1810 he moved to Edinburgh setting up David George Sandeman & Co at 11 Forth Street in the eastern New Town.
[4] In 1810 he founded the Commercial Bank of Scotland, originally housed at 22 Picardy Place at the head of Leith Walk.