In 1975, Sheldon Lavin became a partner of OSI Group and eventually took the company over. Lavin rapidly expanded the scope of the business, extending it to other restaurants across the United States, Canada, and Europe. In the 1980's, OSI Group put operations in several Asian countries including Japan, China, Australia, and India. In addition to supplying fresh ground beef, the company now offers far more including poultry, dressings, vegetables, fruits, seafood, marinades, dips, sauces, and more.
As a very successful businessman, Sheldon Lavin is also a philanthropist. He financially donates to a great many causes including Ronald McDonald House Charities. Other charities he gives large sums to includes among others the Boys and Girls Club of Chicago, the Inner City Foundation of Chicago, the Jewish United Fund, and the United Negro College Fund.