Eric Horvitz is chief scientific officer at Microsoft, providing leadership and perspectives on scientific matters and on issues and opportunities at the intersection of technology, people, and society. He has pursued principles and applications of AI with contributions in machine learning, perception, natural language understanding, and decision making. His research centers on challenges with uses of AI amidst the complexities of the open world. Horvitz’s efforts and collaborations have led to fielded systems in healthcare, transportation, ecommerce, operating systems, and aerospace. As a member of the President’s Council of Advisors on Science and Technology (PCAST), he advises U.S. leadership on matters involving science, technology, education, and innovation policy.