John Jeffries ( February 5th, 1745 - September 16th, 1819 ) was born in Boston ( Massachusetts, present day the United States of America ). He graduated from Harvard College ( Class of 1763 ) and obtained his medical degree at the University of Aberdeen ( Scotland ).
Dr. John Jeffries played a large role in the trial for the Boston Massacre ( March 5th, 1770 ) as a witness for the defense. Between 1771 through 1774, John Jeffries was a surgeon on board a Squadron of British ships in Boston Harbor and helped the wounded British soldiers at the Battle of Bunker Hill ( American Revolutionary War, June 17th, 1775 ).
He is credited with being among America's first weather observers. He began taking daily weather measurements in 1774 in Boston.
He then fled to Halifax ( Nova Scotia, present day Canada ) in 1776 and later to England ( 1779 ), and was employed by the Crown during this time.
In 1785, John Jeffries and Jean - Pierre Blanchard ( 1753 - 1809 ) crossed the English Channel in a balloon, becoming the first human beings to cross the Channel by air.
John Jeffries lived in England from 1779 to 1790. Despite being named in the Massachusetts Banishment Act, he returned to private practice in Boston, staying there until his death.
( source : Wikipedia )