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International Law
International Environmental Law
Property Law
Ecosystem Management and the Law
Environmental Protection and International Law in Latin America
Environmental Law
Administrative Law

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Annecoos (Anna) Wiersema

International Law
Environmental and Natural Resources Law
International Environmental Law


S.J.D., 2004, Harvard University
LL.B. (Hons), 1998,The London School of Economics and Political Science, UK
B.A. (Hons), University of Southampton, UK

Prof. Wiersema’s research focuses on international environmental law, with particular emphasis on international wildlife law, species and biodiversity conservation, and forest conservation. Her most recent work addresses debates about markets for endangered species and the REDD+ program under the international climate change regime. In addition, she writes about the structure of the international environmental legal system, having addressed the role of conferences of the parties in international law-making. Prof. Wiersema’s work breaks down the traditional division of local, national, and international perspectives and is deeply informed by theories of ecological complexity and scientific uncertainty. Prof. Wiersema is a member of the IUCN’s World Commission on Environmental Law and a Member of the Board of Editors for the Journal of International Wildlife Law and Policy.

Prof. Wiersema was Director of the International Legal Studies Program at the Sturm College of Law from 2013-2015 and held the Ved P. Nanda Chair. Prior to joining the faculty at the University of Denver Sturm College of Law, Prof. Wiersema was an Assistant Professor at The Ohio State University Michael E. Moritz College of Law and worked in the Denver office of Arnold and Porter LLP as a litigation associate. Prof. Wiersema was the George W. Foley, Jr. Fellow in Environmental Law at Harvard Law School from 1999-2000 and spent time as a Visiting Scholar at the International Monetary Fund (IMF) in 2001.

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Featured Publications

  • Uncertainty, Precaution, and Adaptive Management in Wildlife Trade, 36 Michigan Journal of International Law, Forthcoming.
  • Climate Change, Forests, and International Law: REDD’s Descent into Irrelevance, 47 Vand. J. Transnat’l L. 1 (2014).
  • Uncertainty and Markets for Endangered Species under CITES, 23(3) Review of European, Comparative & International Environmental Law 239 (2013).
  • What Can the WTO Learn from International Environmental Law?, Panel: Risk, Science and Law in the WTO, 104 AM. SOC’Y INT’L L. PROC. 23 (2010).
  • The Scope of the Secretariat’s Powers Regarding the Submissions Procedure of the North American Agreement on Environmental Cooperation under General Principles of International Law, co-authored with Anne-Marie Slaughter, 27 NORTH AMERICAN ENVIRONMENTAL LAW AND POLICY SERIES 1 (2010).