Mukesh Ambani is the chairman, managing director, and largest shareholder of Reliance Industries, India's largest private sector enterprise. With its wide-ranging operations, Reliance Industries has been called India's General Electric (NYSE: GE), and Ambani's personal stake in Reliance Industries is around 48 percent.

Ambani's net worth of US $20.1 billion early in the year made him the world's 14th richest person and the second richest person in India after steel tycoon Lakshmi Mittal. However, by October, Ambani's net worth had more than doubled, making him the richest Indian, and number four in the world, just behind Warren Buffett. In fact, a strong, temporary share price rally for Reliance at the end of October brought Ambani's net worth to $63.2 billion, making him briefly the richest man in the world.

But that isn't the only highlight for Ambani in 2007. Construction also began on his home, which is expected to cost US $1 billion, and be one of the tallest structures in Mumbai (formerly Bombay), the equivalent of a 60-story building. The glass tower will include a plush movie theater, a health club with a pool, gardens and terraces, and parking for 168 automobiles, as well as an in-house garage to service them. Living space for the family near the top will have a view of the Arabian Sea, and the roof will have three helipads. It will take a domestic staff of 600 to run the place, which was designed by an architecture firm from Chicago to be reminiscent of the Hanging Gardens of Babylon, one of the Seven Wonders of the Ancient World.

Yes, it's been a very good year for Mukesh Ambani, and also for his wife, to whom he gave an Airbus 319 as a birthday gift.

Be sure to check out more Money Winners of 2007.