John Jeffries (* 5 February 1744 in Boston (Massachusetts), "† 16 September 1819 ebenda) was an American physician and air pioneer.

Jeffrey studied medicine in London and Aberdeen and graduated 1763 in Harvard, where he also attained a doctorate to 1769. Then it returned to Boston, where it practiced as a physician and worked from 1771 to 1774 as a ship's doctor on a British ship with Bostoner home port. With the massacre of Boston, with which 1770 five civilians were shot by English troops with a road battle, he was as a physician of Patric Carr - one of the victims - principal witness of the accusation.

With the evacuation Bostons by the British on the occasion of the American civil war it accompanied the troops to Halifax, where it was promoted to surgeon general and in the army of new Scotland (new facts Scotia) served. In March 1779 it went to England and became a medical officer of the English troops in America, where it at the 11. March 1780 its services in Charleston (South Carolina) took up. But in the December of the same yearly it already gave its office up and returned to London, where it opened a practice and itself with scientific, main anatomical investigations busy.

World-wide became it admits as aviation pioneer and a "“first flying American"”, when it flew over the English Channel in a hot-air balloon on 7 January 1785 together with Jean Pierre Blanchard. 1786 published Jeffrey A Narrative OF Two Aerial Voyages ("“a narration of two air passage"”).

While Blanchard Zeit of its life profited from this event, it became fast again quiet around Jeffries. In the summer 1789 it returned to Boston, where it turned again to its medical occupation and held the first anatomy lecture in new England. The violent public resistance at that time against dissecting forced it however to the task of this activity.

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