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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) 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)

By Associated Press August 11, 2016 4 min read

NEW YORK (AP) – 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.

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

The site is known for its celebrity and newsmaker blogs and was a pioneer in the “aggregation” model in online news, using articles and information from different news organizations and its own contributors. But within seven years, The Huffington Post had landed a Pulitzer Prize for national reporting on its series about wounded veterans. It was a 2016 Pulitzer Prize finalist for national reporting for a multimedia project on opioid addiction.