Arianna Huffington signs off at The Huffington Post

FILE - This Feb. 24, 2013 file photo shows Arianna Huffington arrives at the 2013 Vanity Fair Oscars Viewing and After Partyl in West Hollywood, Calif. Huffington says she is stepping down as editor-in-chief to focus on a health startup, Thursday, Aug. 11, 2016. (Photo by Jordan Strauss/Invision/AP, file)

NEW YORK — The Huffington Post is going to be without a Huffington.

Arianna Huffington, The Huffington Post's editor-in-chief, announced Thursday that she's leaving to head a new health, wellbeing and productivity startup.

The one-time conservative commentator oversaw explosive growth at the liberal online blog and news site that she co-founded in 2005, which went on to win a Pulitzer in less than a decade.

"I thought HuffPost would be my last act," Huffington said in a tweet . "But I've decided to step down as HuffPost's editor-in-chief to run my new venture, Thrive Global."

The Huffington Post is now owned by Verizon Communications Inc., and her departure comes several weeks after Verizon said it was buying the media properties of Yahoo Inc. for about $4.8 billion. Representatives for New York-based Verizon and The Huffington Post did not respond to a request for comment Thursday morning.

The site is known for its celebrity and newsmaker blogs and for cobbling together articles using information from different newspapers and other sources. In 2012, it won the Pulitzer Prize for national reporting on its series of stories about wounded veterans.

Huffington's new venture, Thrive Global, will provide training, seminars and coaching about reducing stress and exhaustion. The company, which is expected to launch in November, shares a name with her well-being book "Thrive." Earlier this year she published "The Sleep Revolution," a book about getting more sleep.

Huffington said she couldn't run The Huffington Post and Thrive Global at the same time.

"Running both companies would have involved working around the clock," she said in a press release, "which would be a betrayal of the very principles of Thrive I've been writing and speaking about."

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