What careers did Clara Barton have?

She was a school teacher in New Jersey when starting at the age of 15. Then she became a U.S. Patent office clerk. While working there she learned of the need for medical supplies to treat the wounded from the first Bull Run. She decided to set up a drive and collected medical supplies. Soon the Union was letting her ride in the medical carts with the wounded. She helped as a nurse and tried to keep them possitive. Then she became a nurse and obtained the nickname "Angel of the Battlefield". There she founded The Red Cross and was president of the Red Cross before retiring and dying.