Previously, he was a professor at the Southwest University of Political Science and Law, China, visiting professorial fellow at UNSW, and the Max Weber Fellow at the European Univesity Institute. Heng is also a member of the Executive Council of the Society of International Economic Law (SIEL), and of the Steering Committee of the Asian International Economic Law Network (AIELN). He serves as a book manuscript reviewer for Cambridge University Press, and a member of Asian WTO Research Network (AWRN).