Background
He was born at Montrose to stonemason David Mellison Johnston and Agnes Merrillees.
He was born at Montrose to stonemason David Mellison Johnston and Agnes Merrillees.
He migrated to New South Wales around 1838 and became a general merchant at Clarence Town on the bank of the Williams River. In 1877 he was elected to the New South Wales Legislative Assembly for Williams, but he was defeated in 1880. Johnston died at Marrickville in 1894.