Arianna Huffington is a Greek-American author, businesswoman, and media mogul best known as the co-founder of The Huffington Post, which became a major online news platform. She later founded Thrive Global, a company focused on well-being, productivity, and mental health. A prolific writer, she has authored multiple books on topics ranging from politics to sleep and personal wellness. Huffington is widely recognized for her influence in media, entrepreneurship, and advocacy for work-life balance.