He was born in Scotland in 1797 and came to Lower Canada with his family around 1800, growing up in Montreal.
He became a merchant at Saint-Eustache and a member of the militia, but was dismissed in 1827 for participating in meetings supporting the Parti patriote.
In 1844, he was elected to the Legislative Assembly of the Province of Canada for Deux-Montagnes; he was reelected in 1848 and 1851.
Scott supported the Rebellion Losses Bill compensating residents of Canada East for property losses during the Lower Canada Rebellion; Scott himself was compensated for damage to his home and business.
Although he had been living with his Catholic wife since 1829 and they had five children, because he was a Presbyterian, they were only married two days before his death after Scott was able to persuade bishop Ignace Bourget to allow the marriage.