Arianna Huffington has had a rich and prolific career. A best selling author and TV presenter, her political transformation saw her first stand as a Republican candidate before switching to the Democrats, as she sought high public office. After setting up the highly sucessful internet newspaper, The Huffington Post, which championed "citizen journalism", this week she agreed a buyout by media giants AOL. But who is Arianna Huffington and what makes her tick? In this week's Profile, Emma Jane Kirby, looks into the life of America's latest media mogul and asks what next for the woman who's been described as "the most upwardly mobile Greek since Icarus".