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:

The Rendition of Anthony Burns, Part 1
34:40

SYMHC Classics: Samuel Pepys
33:09

Behind the Scenes Minis: Pollution Olympics
24:24