Sophia Amoruso is an American entrepreneur and author, best known as the founder of the fashion retailer Nasty Gal. She started the company in 2006, initially selling vintage clothing on eBay. Under her leadership, Nasty Gal grew rapidly, becoming a prominent online brand. In addition to her business success, Amoruso wrote the bestselling book Girlboss, which details her journey and offers career advice. The book inspired a Netflix series of the same name, further solidifying her influence in the fashion and business worlds.