AT&T Corp., originally American Telephone and Telegraph Company, is an American telecommunications company that provides voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies. During its long history, AT&T was at times the world's largest telephone company, the world's largest cable television operator, and a regulated monopoly. At its peak in the 1950s and 1960s, it employed one million people and its revenue was roughly $300 billion annually in 2006 dollars.

In 2005, AT&T was purchased by Baby Bell SBC Communications for more than $16 billion ($19 billion in present-day terms). SBC then rebranded itself as AT&T Inc. Today, AT&T Corporation continues to exist as the long distance subsidiary of AT&T Inc., and its name occasionally shows up in AT&T press releases.

The formation of the Bell Telephone Company superseded an agreement between Alexander Graham Bell and his financiers, principal among them Gardiner Greene Hubbard and Thomas Sanders. Renamed the National Bell Telephone Company in March 1879, it became the American Bell Telephone Company in March 1880. By 1881, it had bought a controlling interest in the Western Electric Company from Western Union. Only three years earlier, Western Union had turned down Gardiner Hubbard's offer to sell it all rights to the telephone for $100,000 ($2.41 million in 2009 dollars).

AT&T Inc. (sometimes stylized as at&t; NYSE: T, for "telephone") is an American multinational telecommunications corporation headquartered in Whitacre Tower, Dallas, Texas, United States. It is the second^{[citation needed]} largest provider of mobile telephony and largest fixed telephony provider in the United States, and is also a provider of broadband subscription television services. As of 2010^[update], AT&T is the 7th largest company in the United States by total revenue, as well as the 4th largest non-oil company in the US (behind Walmart, General Electric, and Bank of America). It is the 3rd largest company in Texas by total revenue (behind ExxonMobil and ConocoPhillips) and the largest non-oil company in Texas. It is also the largest company headquartered in Dallas. In 2011, Forbes listed AT&T as the 14th largest company in the world by market value and the 9th largest non-oil company in the world by market value. It is the 20th largest mobile telecom operator in the world with over 100.7 million mobile customers.

Mark Cuban (born July 31, 1958) is an American business magnate. He is the owner of the National Basketball Association's Dallas Mavericks,Landmark Theatres, and Magnolia Pictures, and the chairman of the HDTV cable network HDNet. He is also a "shark" investor on the television series Shark Tank. In 2011, Cuban wrote an e-book, How to Win at the Sport of Business, in which he chronicles his life experiences in business and sports.

Cuban was born in Pittsburgh, Pennsylvania and grew up in the Pittsburgh suburb of Mt. Lebanon, in a Jewish working-class family. His last name was shortened from "Chabenisky" when his Russian grandparents landed on Ellis Island. Cuban's father Norton was an automobile upholsterer. Cuban's first step into the business world occurred at age 12, when he sold garbage bags to pay for a pair of expensive basketball shoes. While in school, he held a variety of jobs, including bartender, disco dancing instructor, and party promoter. He paid for college by collecting and selling stamps, and once gained about $1,100 from starting a chain letter.