Nathan Bomey USA TODAY About six years ago, Mary Barra was appointed CEO of General Motors, becoming the first woman to lead a major global automaker and raising hopes that the male-dominated industry was embarking on a new era of diversity in its executive ranks. That hasn't happened. The auto industry, as a whole, remains a boys’ club in the upper echelons despite Barra’s success at GM, where she’s widely credited with boosting profits and beating many rivals on self-driving car technology.

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