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Dr. 'John Jeffries' (1745-1819) was a Boston physician, scientist, and a military surgeon with the British Army in Nova Scotia and New York during the American Revolution. He is best known for accompanying Jean-Pierre Blanchard on his 1785 balloon flight across the English Channel. Dr. John Jeffries also played a large role in the trial for the Boston Massacre. He was the star witness for the defense. He was the surgeon for Patrick Carr, who was one of the Americans shot during that incident.