Douglas MacMartin is a Senior Research Fellow in the Sibley School of Mechanical and Aerospace Engineering at Cornell University. His research focuses on climate engineering (also known as solar geoengineering or climate intervention) with the aim of helping to develop the knowledge base necessary to support informed future societal decisions in this challenging and controversial field. He has published extensively on the subject, and in addition to public and academic presentations has provided briefings to the UN Environment Program and testimony to the US Congress, and was a member of the US National Academies panel that made recommendations on both research and governance in March 2021. He received his PhD in Aeronautics and Astronautics from MIT in 1992;previous positions include United Technologies Research Center (1994-2000) and the California Institute of Technology (2000-2015). His research is funded by NSF and by the Cornell Atkinson Center for a Sustainable Future.