His work focused on analyzing the political system of China and understanding China's policymaking process. He also studied China's behavior with regard to international treaties, and contributed insights on U.S.-China relations. He consistently called for a more thoughtful U.S. engagement in Asia, and pushed for more productive relations with China, saying, "China's cooperation is essential to address the problems that threaten humanity: environmental and health issues, agricultural production... and so on. Its constructive engagement in regional issues (Korea, Indochina) is essential to attainment of regional stability. And it is not in America's interest for its China policy to drift far from that of Japan or Western Europe."