Sujit Choudhry is a Barrister and Solicitor (Ontario, 2001) and an internationally recognized authority on comparative constitutional law. He has been an advisor to constitution building, governance, and rule of law processes for over 20 years, including in Egypt, Jordan, Libya, Myanmar, Nepal, South Africa, Sri Lanka, Tunisia, Ukraine and Yemen. He has lectured or spoken in 30 countries. He has worked in a broad variety of contexts, including during ceasefires and conditions of political violence, and his field experience includes: technical advice to multi-party dialogues, facilitating public dialogue sessions with civil society groups and other stakeholders, leading stakeholder consultations, performing detailed advisory work with technical experts, training civil servants and bureaucrats, engaging party leaders and parliamentarians, and drafting technical reports and memoranda in the field. He founded and directs the Center for Constitutional Transitions (CT), which generates and mobilizes knowledge in support of constitution building by assembling and leading international networks of experts to produce evidence-based policy options for decision-makers and agenda-setting research, in partnership with a global network of multilateral organizations, think tanks, and NGOs. CT has worked with over 50 experts from over 25 countries. Choudhry has published over 100 articles, book chapters, policy manuals, reports and working papers. His edited volumes include The Oxford Handbook of the Indian Constitution, Constitution-Making, Constitutional Design for Divided Societies, The Migration of Constitutional Ideas, Territory and Power in Constitutional Transitions and Security Sector Reform and Constitutional Transitions (forthcoming). He is a member of the team preparing Comparative Constitutional Law: A Global and Interdisciplinary Approach (OUP).

Choudhry is a leading expert on the Canadian constitution, and has written extensively on the Canadian Charter of Rights and Freedoms and federalism, often in a comparative context. His work has been cited with approval by the Supreme Court of Canada, the Supreme Court of New Zealand, and courts across Canada. He has provided legal counsel on complex constitutional and policy issues to Canadian governments, private corporations, royal commissions, public sector agencies and NGOs. Choudhry appeared as counsel before the Supreme Court of Canada in Charkaoui (security certificates), and in Khadr 1 and Khadr 2 (Guantanamo detainees), which addressed mixed questions of international and domestic law.

Choudhry was named Practitioner of the Year by the South Asian Bar Association of Toronto in 2011. In 2015, the South Asian Bar Associations of Southern California and Northern California each awarded Choudhry the Trailblazer Award. In 2010, Choudhry received the Trudeau Fellowship, the Canadian equivalent of the MacArthur awards. Choudhry sits on the Board of Editors of the International Journal of Constitutional Law (ICON) and the Executive Committee of the International Society of Public Law (ICON-S).