Mattea is the energy transition policy lead at Evergreen. Her policy research focuses on climate, clean energy, and a swift and just transition away from fossil fuels. Prior to joining Evergreen, Mattea worked as a journalist, reporting on the climate crisis from Kiribati, Nepal, and the US. Mattea has also worked for the United Nations Development Program (UNDP) Equator Initiative, Refugees International, and Climate Law and Policy (CLP). Mattea earned a degree in environmental studies and human rights at Harvard University. She was a 2019 Rhodes Scholar at the University of Oxford, where she studied a Master of Public Policy (MPP) and a Master of Refugee and Forced Migration Studies. Mattea grew up in Portland, Oregon and Tāmaki Makaurau, Aotearoa New Zealand.