Fortune launched its annual 40 Under 40 list yesterday, and it is chock-full of fascinating leaders worth checking out. One of the 16 women on the list is Dianne McKeever, a 38-year-old who last year became the only woman running an activist hedge fund that’s shaking up U.S. companies when she launched her firm Ides Capital.

One of the companies she’s targeted, Boingo Wireless, has seen its shares rise more than 20% since McKeever revealed her campaign to boost the company’s value in March. The move eventually resulted in Boingo adding its first female director, not to mention a 55% return for McKeever’s firm.

Fortune’s Jen Wieczner, who wrote the profile of McKeever, reports that the corporate governance guru doesn’t really like talking about her gender, but there’s no doubt that being a woman has made her a groundbreaker on Wall Street, and that’s something to celebrate.

clairezillman

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