Twitter’s chief executive, Jack Dorsey, announced the hire, and Berland confirmed her appointment — on Twitter, of course.
"I'm thrilled to have the opportunity to work with Jack and the Twitter teams to bring the magic of Twitter to life, broaden its reach, and deepen its impact as the company enters this incredibly exciting new chapter," Berland said in a prepared statement.
The company did not previously have a CMO.
News of Berland's hiring comes only a day after four Twitter executives left the company.
The San Francisco social media company announced Monday the departure of Alex Roetter, senior vice president of engineering; Brian "Skip" Schipper, vice president of human resources; Katie Stanton, vice president of global media; and Kevin Weil, senior vice president of product. Dorsey said they had "chosen to leave the company."
In addition, Jason Toff, general manager of the Twitter-owned social media app Vine, said he was leaving for Google to work on virtual reality.
Twitter has now lost eight of 13 executives who presented at the company's analyst day last year.
Twitter's stock fell again in morning trading, down 47 cents, or 2.76%, to $16.55.
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