Manning-Jackson
Between 1967 and 1981 she won ten national titles and set a number of American records.
She participiated in the 1968, 1972, and 1976 Summer Olympics. She likely also would have participated in the 1980 Games in Moscow, were they not boycotted by the United States.
At the 1968 Olympics she was awarded a gold medal in the 800 m, the only American woman to win this event. Until 2008, she was the youngest winner of the event.
At the 1972 Games in Munich she won a silver medal in the 4 x 400 m relay with teammates Mable Fergerson, Kathy Hammond, and Cheryl Toussaint.
In 1984 she was inducted into the United States National Track and Field Hall of Fame.