In a long and illustrious career - in which he has helped shape the direction of Taiwan's financial system, and become the most seasoned expert on the WTO - it is perhaps surprising to learn that Ching-Chang Yen started out wanting to be a painter. His office in Taipei testifes to his continuing love of art: on his walls hang European impressionist works in oils next to classic Chinese calligraphy, all of which come from his own extensive art collection.