German entrepreneur Ralph Dommermuth is the founder and CEO of United Internet AG with an estimated net worth of $4.1 billion as of May 2015 according to Forbes. He is also the 42nd richest person in Germany and the 641st in the World Billionaires List.

Mr. Dommermuth began accumulating his estimated net worth of $4.1 billion when he worked as a freelance in marketing a local pc retailer after his training at the Deutsche Bank in 1983. Later on, he has developed marketing services for bigger clients including IBM, Compaq and Deutsche Telekom. Today, he has built one of the leading internet service providers in Germany, the United Internet AG. With it, he also has built a multi-billion-dollar fortune.

Ralph Dommermuth owns more than 40% of the publicly traded internet company that also provides email services and storage. It also pushes the growth of mobile application in Germany and around the world. In the past year, shares in the company were up which also added several million dollars to his earnings.

As an avid sailor, Dommermuth is the sponsor of the newly founded United Internet Team Germany during its first participation in the America’s Cup.