Hearst Magazines announced today that Anne Fulenwider, the editor in chief of Marie Claire, would leave her post at the end of the year. Aya Kanai, the chief fashion director of Hearst, has been named the new editor of the women’s magazine, and will start in January.

Ms. Fulenwider has been the top editor at Marie Claire since 2012, when Joanna Coles left the post for Cosmopolitan. One of Ms. Fulenwider’s chief accomplishments was establishing the Power Trip, a 36-hour networking blitz that connects female entrepreneurs, executives and investors in New York and San Francisco.

“I’ve been so inspired by this generation of women that’s disrupting and creating industries,” Ms. Fulenwider, 47, said in a telephone interview. “Their energy and sense of possibility is infectious.”

So inspired, in fact, that she plans to join them. Ms. Fulenwider said that she is leaving the magazine world to build a start-up dedicated to women’s health.