They may be the children of Hans Liebherr, one of the very most revered industrialists in Germany’s post-World War II era. When he died in 1991 in the age 78, Willi and Isolde, took control of the direction. He joined the company in 1971 upon earning his mechanical engineering degree from the Federal Institute of Technology in Zurich while his sister, Isolde, joined the company in 1976 after earning her direction degree from the Business School of Mannheim (Germany). Willi’s & Isolde’s children are also portion of the institution ‘s management. Jan, Willi’s son, shares management duty along with his father on individual departments with focus on earth-moving machinery and parts while his sister, Sophie Albrecht, shares management responsibility along with his father for the mobile cranes and mining. Isolde’s daughter, Stefanie Wohlfarth, is a part of her mom’s direction responsibilities in the appliances section while her sister, Patricia Ruef, presides over the maritime cranes department also with their mom. As of 2013, Liebherr Group has sales of $12.4 billion. In addition, it possesses six luxurious hotels in Germany, Austria and Ireland. It employs more than 39,000 people in its 130 businesses on each continent. Liebherr-International AG in Switzerland, its holding company, is fully owned by members of the Liebherr family.