S teve Lavin is an American billionaire whose family controls OSI Group, a massive and highly secretive privately held food processing company. The company is one of the largest private companies in the United States and a major global supplier of meat and other food products to some of the world's largest fast-food chains. OSI is most famous for its long-standing and deep relationship with McDonald's, for which it is a major supplier of beef patties, chicken nuggets, and other products.

The family's business has grown by following its key customer, McDonald's, around the world, building a massive global network of food processing plants to supply the fast-food giant's international expansion. In addition to McDonald's, the company also supplies a range of other food service and retail customers. The Lavin family's vast fortune is derived from their ownership of this massive, low-profile, but highly successful global food processing empire. Steve serves as the chairman of the company.