Capitol Hill

From 1989 to 1992, she served as senior counsel to the United States Senate Committee on Environment and Public Works.

Clinton administration

In 1992, she was appointed by Janet Reno to serve as deputy associate attorney general at the United States Department of Justice, with oversight of the Environment Division. Medina was later appointed to serve as general counsel of NOAA from 1997 to 1999. As general counsel of NOAA, Medina represented the United States in several international negotiations, and argued and won significant cases before the United States courts of appeals.^[5]

2000–2008

Medina served as a senior officer in the Pew Environment Group, where she provided advice and assistance on issues of marine law and policy. Medina also worked in the U.S. Office of the International Fund for Animal Welfare and spent a number of years as a partner at the law firm of Heller Ehrman, with a practice focused on environmental law, corporate law, and biotechnology matters. Medina served on the presidential transition team of Barack Obama.^[6]

Obama administration

In the Obama administration, Medina served as principal deputy undersecretary for oceans and atmosphere of the National Oceanic and Atmospheric Administration.^[7] Medina also served as the U.S. Commissioner to the International Whaling Commission.^[8][9] Medina led efforts on Arctic conservation, restoration of the Gulf of Mexico after the Deepwater Horizon oil spill, conservation of endangered species, and fisheries management and enforcement.^[10]

Medina later served as special assistant to United States Secretary of Defense Leon Panetta, where she played a role in eliminating discrimination against women in the military and in addressing military sexual assault.^[11] Medina also drafted the rule overturning the ban on women from “combat” positions strictly because of their gender.^[12] Medina later served as a member of the Defense Department Advisory Committee on Women in the Services.

2013–present

Medina currently runs Our Daily Planet, an email newsletter about climate change and the environment. Previously she served as deputy director of the environment program at the Walton Family Foundation^[13] and an adjunct professor in the School of Foreign Service at Georgetown University. Prior to joining the Walton Family Foundation she served as the senior director of ocean policy at the National Geographic Society.^[14][15] Medina is also a board member of the Service Women's Action Network and the Georgetown Sustainable Oceans Alliance board.^[16]

Medina has written opinion columns for The New York Times, HuffPost, The Hill, and USA Today. Medina frequently writes about environmental policy, and has authored columns supportive of the Green New Deal.^[17][18][19] Medina has appeared on MSNBC, CNN, CGTN America, and NPR.^[20][21][22]

In April 2021, Medina was nominated to serve as an Assistant Secretary of State for the Bureau of Oceans and International Environmental and Scientific Affairs in the Biden administration. Her nomination was reported favorably by the Senate's Foreign Relations Committee on August 4, 2021. Medina was officially confirmed by the entire Senate on September 28, 2021, by a vote of 61–36.^[23]

In 2023, Media was named president and CEO of the Wildlife Conservation Society^[24]