Williams came of a cadet branch of the Dorset family long settled at Herringstone. He and his brothers sought their fortunes in London. At 14 he was apprenticed to a cabinet maker of Covent Garden. After fitting out the cabins of East India Company ships he became a shipbuilder, and at his death owned 14 East Indiamen.
Williams, whose son Robert entered Parliament in 1802, contested Dorchester on the independent interest in 1806. He was defeated then, but came in unopposed in 1807. He supported administration, but not as actively as his son, like whom he voted against parliamentary reform, 21 May 1810. He was listed as ‘against the Opposition’ at that time. No speech of his is known. In 1812 he retired in favour of his son Robert. He died 17 Jan. 1814, worth over half a million.
