A King's Counsel, he acted as Official Solicitor or counsel of the Lords Commissioners for Trade and Plantations, owner of lands in New England, and colonial agent of Connecticut.
Jackson was called to the bar in 1744; he became a bencher of Lincoln's Inn in 1770 and its treasurer in 1780.
Jackson was a collaborator in Franklins' political interests during their London years.
He was also Member of Parliament for Weymouth and Melcombe Regis from 1762 to 1768 and for New Romney from 1768 until 1784, and was one of the Lords of the Treasury from 1782 to 1783.
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