Mildred A. Wirt was an American author. She is best known for her work on the early Nancy Drew series.
Penny Parker starred in a series of 17 books written by Mildred A. Wirt Benson and published from 1939 through 1947. Penny was a high school sleuth who also occasionally moonlighted as a reporter for her father's newspaper. Benson favored Penny Parker over all the other books she wrote, including Nancy Drew. Her obituary quoted her as saying, "I always thought Penny Parker was a better Nancy Drew than Nancy is," Mrs. Benson said in 1993.