American investor George Lindemann is the Chairman and Chief Executive Officer of the Southern Union who has an estimated net worth of $4.2 billion as of May 2015 according to Forbes. In the “Forbes 400” list, he is the 218th richest person and is ranked 613th in the list of World Billionaires.

Born George L. Lindemann in New York City, he earned his degree in economics from the Wharton School of the University of Pennsylvania. He currently owns 19 Spanish-language radio stations.

Lindemann began accumulating his estimated net worth of $2.4 billion when he became the president of a pharmaceutical company, Smith, Miller and Patch. He then sold the family eye-care company, Permaliens, to Cooper Labs for $75 million in 1971 to start Vision Cable in 1972. After a decade, he sold the cable TV company to Samuel Newhouse and his brother for $220 million.

George Lindemann then started Metro Mobile, a cell phone company, which he sold to Bell Atlantic in 1991 for $2.5 billion. He turned to the energy business and became the CEO of the natural gas company, Southern Union. He sold the company in 2012 for more than $5 billion in cash and stock to Energy Transfer Equity owned by Texas billionaire Kelcy Warren.

Aside from his own businesses, Lindemann served as the president of Cellular Dynamics and the managing general partner of Activated Communications Limited Partnership since 1982. Since 1990, he has been the general partner of Panhandle Eastern. He also sits on the board of directors of HI Europe Limited and on the advisory board of Hudson Clean Energy Partners.