D an Olsson is a Swedish billionaire and the head of the family that controls the Stena Sphere, a massive and highly diversified privately held conglomerate. The company was founded by his late father, Sten Allan Olsson, in 1939 as a trading company and was built into a shipping giant. Dan took over the leadership of the group in the 1980s and has since vastly expanded and diversified its operations.

The Stena Sphere is a sprawling and complex empire with core businesses in ferry lines (Stena Line), shipping (Stena Bulk), offshore oil drilling (Stena Drilling), and real estate. The group also has significant interests in finance and recycling. As the CEO and now chairman of the main holding company, Dan Olsson has been the strategic mind behind the group's global expansion for decades. The company remains wholly owned by him and his siblings, Jenny and Madeleine, and is known for its long-term perspective and its discreet, family-controlled culture.