People have compared Jane Maas to Peggy Olsen of "Mad Men," but in reality Peggy seems to have more autonomy than the former Ogilvy creative.

Women "weren't allowed to work on financial, because [male executives] figured we didn't know how to balance our checkbooks, we weren't allowed to work on automotive because they figured we didn't know how to drive a car."

But today Ms. Maas, the author of "Mad Women: The Other Side of Life on Madison Avenue in the '60s and Beyond," cringes while remembering some blatantly sexist work she did on accounts like Maxwell House.

In this video, she also explains the pay gap and between men and women and why so few questioned it.