Stavros Niarchos III net worth: Stavros Niarchos is a Greek professional kiteboarder and the heir to the Niarchos shipping fortune who has a net worth of $100 million. Born in New York City, Stavros Niarchos III, grew up primarily in Paris, France. He went to high school at College Stanislaus in Paris, but spent his last year at Seabury Hall, a prestigious prep school in Maui, Hawaii. He went on to graduate from the University of Southern California Film School. He is the oldest grandchild born to Stavros Niarchos, who founded a massive shipping empire based in Greece. He was the man who built the first supertankers, and the family fortune was largely built on his ships' popularity with the oil industry. The younger Mr. Niarchos has become known for his almost continual string of high-profile relationships. He has been romantically linked to Lindsay Lohan, Mary-Kate Olsen, and has had a long-standing on-again, off-again relationship with Paris Hilton.