Justice has postgraduate law degrees from Harvard Law School, where he researched into corporate law, governance and finance; and from Cardiff School of Law and Politics, where he researched into disability human rights. He was admitted to the Ghana bar in 2011. Justice currently teaches Constitutional Law and International Human Rights Law at the Faculty of Law of the Ghana Institute of Management and Pubic Administration (GIMPA). His areas of research, practice and publication include, constitutional history, human rights policy and enforcement in developing democracies, corporate governance, parliamentary oversight and governance, disability rights and social care law. He has delivered lectures on topics in these areas in Africa and elsewhere. Justice has worked briefly as the Legal and Regulatory Affairs Manager at SAB Miller (Ghana). He also held a fellowship with the Open Society Foundation, New York.