Co-founder moves to new venture
Huffington steps down from online news site
Ms Huffington saw it grow beyond her expectations after launching it with American businessman Kenneth Lerer and other investors in 2005 and selling it just six years later to Aon for $315 million.
In 2012 the site won a Pulitzer Prize for national reporting in the US.
Huffington, 66, will switch her attention to corporate and consumer wellbeing and productivity platform Thrive Global.
In a tweet announcing her plans, she said: “I thought HuffPost would be my last act. But I’ve decided to step down as HuffPost’s editor-in-chief to run my new venture, Thrive Global.”
She was born Arianna Stassinopoulos in Athens in 1950 and studied economics at Cambridge University, where she became president of the Cambridge Union.
She moved to America and in 1986 married Texas oil billionaire Michael Huffington.