Jemy is a lawyer specializing in international law, constitutional law, and the philosophy of law. He is the Dean of the Institute of Law, as well as the Vice Chairman of the Operations Committee, of the School of Social Sciences, Law, and Governance. He is an opinions columnist for BusinessWorld and Of Counsel for the Policarpio and Acorda Law Office.
On scholarship from the Cambridge Overseas Trust, Jemy read international law at the University of Cambridge. Upon the invitation of the US State Department, he attended the Study of US Institutes (SUSI) program, focusing on constitutional law and political thought. He received his Doctor of Juridical Science degree from San Beda College, where his dissertation work focused on the natural law, the Philippine Constitution, and the limits of judicial power.
Jemy lectures on international law, international trade law, philosophy of law, and constitutional law for various governmental and academic institutions, including the Philippine Judicial Academy, Congress, and the Integrated Bar of the Philippines, and is a member of the National Transplant Ethics Committee