Katharine Mach is a Senior Research Scientist at Stanford University. She leads the Stanford Environment Assessment Facility (SEAF). Advancing foundations for action, her research is focused on integrative assessment of climate change risks and response options. The goal is innovating and evaluating new approaches to assessment, simultaneously applying them to inform decisions and policy. Priorities include methods for integrating evidence, applying expert judgment, and communicating resulting syntheses of knowledge. From 2010 until 2015, Mach co-directed the scientific activities of Working Group II of the Intergovernmental Panel on Climate Change, which focuses on impacts, adaptation, and vulnerability. This work culminated in the IPCC’s Fifth Assessment Report and its Special Report on Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation. The associated global scientific collaborations have supported diverse climate policies and actions, including the Paris Agreement. Mach received her PhD from Stanford University and AB from Harvard College.