Germany’s richest man. Karl and his younger brother, Theo, developed their mother’s corner grocery store into discount supermarket giant Aldi, which now has more than 7,000 stores and $45 billion in sales. They eventually split ownership and management of the chain into the North and South regions. Now retired, Karl used to manage the more profitable southern half of Aldi’s business in Germany. This billionaire fiercely guards his privacy: little is known about him other than that he apparently raises orchids and is an avid golfer.