John A. Catsimatidis (born September 7, 1948) is an American businessman and radio talk show host. He is the owner, president, chairman, and CEO of grocery chains Gristedes and D'Agostino Supermarkets in Manhattan, as well as the Red Apple Group, a real estate and aviation company with about $2 billion in holdings in New York, Florida and Pennsylvania. He is also the chairman and CEO of the Red Apple Group subsidiary United Refining Company. Catsimatidis was the runner-up in the Republican nomination for mayor of New York City in the 2013 election.