That was just the beginning of a legend. On a steamship returning from China to Europe in 1906, Zhang had a chance encounter with Sun Yat-sen, founder of the Nationalist Party of China, who today is considered pivotal in overthrowing the rule of the Qing Dynasty (1644-1911) and thus ending the country's feudal history stretching over millennia.

Immediately enchanted, Zhang pledged support.

"The two established a code for Sun to use if he needed money: 'A' meant send 10,000 francs, 'B' meant send 20,000 francs and so forth," Chen says. "This was a pledge that Sun took only half seriously until 1907, when a cash-strapped Sun, with few donors to turn to for his revolutionary cause, sent a telegram to Zhang with the letter C. A few days later 30,000 francs appeared in Sun's bank account.

Drawing from the huge profit generated mainly by his sale of ancient Chinese artworks and antiques, Zhang was able to offer continued support to Sun. When Sun, afflicted by cancer, signed his will in Beijing in 1925, Zhang was at his deathbed.

By that time Zhang himself had become a key member of the Nationalist Party and was viewed as a mentor by Chiang Kai-shek, who later succeeded Sun as the party leader. However, Zhang fell out with his protege in the 1930s and left China in 1938, after the Japanese invasion. He eventually settled in New York, where he spent the last decade of his life and was buried at Ferncliff Cemetery in Westchester county, about 40 kilometers north of Manhattan.

Two years before Zhang left China, in 1936, Chen was born in Shanghai into a business family whose wealth, although utterly incomparable to that of Zhang's family, was already big enough to open the boy's eyes and mind to the outside world.

"My father was a dentist who made a fortune by manufacturing and selling a hugely popular toothpaste," says Chen, whose own life path somehow reflects the adventurous streak of his entrepreneur father.