Marjorie Merriweather Post is most often mentioned today as the person who built Mar-a-Lago. But she was a unique figure as a woman who helmed a huge corporation when she was still in her 20s in the early 20th century.
Research:

E. Virgil Neal: Hypnotist, Fraudster, Tycoon - Part 1
35:28

SYMHC Classics: Mancini Sisters
42:22

Behind the Scenes Minis: The Apostrophe and the Rich Guy
27:51