49. Mukesh Ambani

Title: Chairman and managing director, Reliance Industries

Country: India

Age: 58

Mukesh Ambani took over as the chairman of Reliance Industries when his father, the company's founder, Dhirubhai Ambani, died in 2002. The enormous industrial conglomerate generates $61 billion in annual sales from its interests in energy, petrochemicals, textiles, natural resources, retail, and, more recently, telecommunications.

Ambani is the richest person in India with a personal fortune of over $23 billion. He owns a 27-story Mumbai mansion that cost $1 billion to build.

And if Ambani's projections for India's economy prove correct, expect that net worth to soar. Four years ago, Ambani predicted that India would grow from a $1.4 trillion economy in 2011 to a $30 trillion economy by 2030 — a bullish estimate considering that India's GDP today stands at $2.2 trillion.