For over two decades, Elizabeth Maruma Mrema has held various positions at the United Nations Environment Program (UNEP), including director of the Law Division, deputy director of the Ecosystems Division, acting director of the Corporate Services Division and executive secretary of the UNEP/CMS (Convention on Migratory Species) Secretariat. Her work at UNEP has focused on the development, implementation and enforcement of environmental laws, including multilateral environmental agreements at national, regional and international levels.