Tony Hsieh is CEO of Zappos.com. In addition to his responsibilities at Zappos, Hsieh is leading the Downtown Project, a group committed to transforming downtown Las Vegas into the most community-focused large city in the world. This transformation includes the relocation of the Zappos.com offices from Henderson, Nev., to the former City Hall in downtown Las Vegas. In 1999, at the age of 24, Hsieh sold LinkExchange, the company he co-founded, to Microsoft for $265 million. He then joined Zappos as an advisor and investor, eventually becoming CEO. He helped Zappos grow from almost no sales to more than $1 billion in gross merchandise sales annually, while simultaneously making Fortune magazine's annual "Best Companies to Work For" list. In November 2009, Zappos was acquired by Amazon.com in a deal valued at $1.2 billion on the day of closing. Hsieh's first book, "Delivering Happiness," debuted at 1 No. on the New York Times best-seller list and has remained on the list every week since June 2010.