Sarah Stimson Karis is co-founder of deux4 LLC, which advises organizations in the environmental and pharmaceutical sectors. She is a member of the Board of Directors of The Henry L Stimson Center, a nonpartisan think tank promoting international security, shared prosperity and justice through applied research and policy innovation. One of her Stimson Center roles is member of the Board of Counselors of the Alliance for a Climate Resilient Earth (ACRE), a global organization that facilitates partnerships between business and policy leaders grappling with the challenges of building climate resilient infrastructure. Most recently, Sarah led collaborations with the Prince Albert II of Monaco Foundation, Solar Eclipse Expedition/World Sky Race and Global Choices.