Arianna Huffington steps down as the Huffington Post Editor-in-Chief to grow her new health and wellness startup, Thrive Global, following Verizons $4.83 .brArianna Huffington is stepping down as Editor-in-Chief of the Huffington Post to run a new health and wellness venture called Thrive Global.brArianna Huffington, co-founder of the Huffington Post, says she will be leaving the company in the coming weeks to focus on a soon-to-launch startup dedicated .brArianna Huffington steps down as Huffington Post editor-in-chief Huffington Post co-founder Arianna Huffington has decided to leave the company to launch a .