Ms. Annie Petsonk is international counsel with Environmental Defense, a leading national environmental advocacy organization. She has participated in the development of climate policy since the inception of the climate treaty talks, including the development of the Intergovernmental Panel on Climate Change Special Report on Aviation and Global Warming. Prior to coming to Environmental Defense, she previously served in the U.S. Justice Department, the Office of the U.S. Trade Representative, the United Nations Environment Programme, and the private bar. A graduate of Harvard Law School, Ms. Petsonk has authored and coauthored many publications on the design of effective international climate policy, including alternative approaches to addressing greenhouse gas emissions in the aviation sector. She currently teaches International Trade and Sustainable Development Law at the George Washington University Law School.