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- EV-olution. The word “transformation” gets thrown around a lot. But few leaders have successfully led companies through one—let alone stayed at the top long enough to try and steer their organization through a second.

Mary Barra, the chief executive officer of General Motors, is in that rare club. Earlier this year, she hit the 10-year mark as CEO, unique for any public company leader but especially a woman. (The average tenure of a Fortune 500 CEO is 7.2 years for men and just 4.5 years for women.) Barra, who ranks No. 1 on this year’s Fortune Most Powerful Women list, came into the job in early 2014, just in time for one of GM’s biggest crises. A few weeks into the role, GM recalled millions of cars due to faulty ignition switches, and Barra found herself testifying in front of Congress—and navigating the automaker through a massive transformation, shifting from a culture that had enabled the crisis to spin out of control to one that encourages employees to speak up, especially on potential safety issues. Fast forward to today, and Barra is now trying to lead GM through another metamorphosis, this time switching from internal combustion engines to electric vehicles.

No transformation is easy. And the growth in demand for EVs has recently slowed, causing GM to say it would be “flexible” in its transition to electric to reflect customer demand. But Barra remains committed to her ambitious goal of going gas-free by 2035: “We never thought this would be a straight line, a linear transformation,” Barra told me during a recent interview. (Read the full Q&A with the CEO here.) “There’s 283 million vehicles in the U.S. alone, so it’s going to take a while to change them out.”

As a GM lifer, Barra has witnessed the company go through several previous evolutions, not to mention a near-death bankruptcy, even before becoming its CEO. But perhaps some of her resolve for this current transformation comes not just from her roots in Detroit’s auto culture but also from Silicon Valley, where she’s been spending more and more time, and where GM now has a research and innovation hub.

“One of the things John Chambers [the former CEO of Cisco] said to me was, ‘in Silicon Valley, most people believe they can do the impossible,’” Barra says, recalling a 2016 trip to the Bay Area with her entire leadership team.

It’s still early days for GM’s switch from internal combustion engines to EVs, and the company certainly has its skeptics. But it’s clear that Barra takes the long view—both when it comes to her leadership style, and to the company’s future.

Read the full story here.

Michal Lev-Ram
michal.levram@fortune.com

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This story was originally featured on Fortune.com