“Zhang Xiaogang, age 54, a Beijing-based painter whose hypnotic portraits have topped $10 million at auction, recently suffered a pair of heart attacks, and his doctors told him – for the first time in his three-decade career – to rest. Few artists embody China’s art boom better than Mr. Zhang, who grew up amid the Cultural Revolution … Yet his desire to keep breakneck pace with China’s developing art scene has taken a toll.”