Thales was an ancient Greek philosopher who engaged in entrepreneurship by using his meteorology skills to forecast weather and invest in olive presses. Later, Greeks engaged in economic activity through local and long distance trade, producing and exchanging goods. Aristotle Onassis became a prominent shipping magnate in the 20th century, amassing the world's largest privately owned shipping fleet through innovative financing techniques and operating internationally to avoid taxes. He expanded his business interests into luxury activities like yachting and island resorts.