Professor at the School of Law of Tsinghua University, Executive Vice President of the WTO Law Research Society of the China Law Society, WTO Appeal Arbitrator, member of the Editorial Board of Journal of World Trade. He was a Deputy Director-General at the Department of Treaty and Law, Ministry of Commerce of China (2008-2014), IP attaché at Chinese Embassy in the United States, Washington, DC (2006.1-2008.9) and WTO Appellate Body member candidate (2016). He participated in China's WTO accession negotiations and WTO dispute settlement cases involving China.