The banking industry lost one of its most prominent women a year ago with the death of Terri Dial. As a leader, a mentor and a C-suite veteran in a male-dominated business, she left a void that has yet to be filled.

Dial spent four decades helping to run some of the country's biggest banks, including Wells Fargo (WFC) and Citigroup (NYSE:C). Her death from pancreatic cancer at age 62 widened a persistent gap in the industry's top ranks, where women are still struggling to find equal footing — or, once there, to keep it.

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