Dorothy Vaughan, American mathematician (died 2008)

Dorothy Jean Johnson Vaughan was an American mathematician and human computer who worked for the National Advisory Committee for Aeronautics (NACA), and NASA, at Langley Research Center in Hampton, Virginia. In 1949, she became acting supervisor of the West Area Computers, the first African-American woman to receive a promotion and supervise a group of staff at the center.

September 20 is the 263rd day of the year in the Gregorian calendar; 102 days remain until the end of the year.