According to the title of an article in Wired, it's Eric Harshbarger. The Alabama native still holds a day job as a programmer, but he's becoming famous for his sculptures made entirely of Lego blocks. His most popular item is a $500 Linux penguin, but he has constructed everything from a full sized desk (which someone at an e-commerce company is actually using) to a working grandfather clock (even the mechanism is made of Legos). The comparison to Michelangelo is overblown hyperbole, but it would be really cool to have a Lego grandfather clock.

http://www.wired.com/news/culture/0,1284,38547,00.html?tw=wn20000902