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Cullen works as a Research Scientist for Policy at OpenAI, where his work focuses on the law, policy, and governance of advanced artificial intelligence. He was previously a Research Affiliate with the Center for the Governance of AI at the Future of Humanity Institute, supported by the Berkeley Existential Risk Initiative. He also served as President of the Harvard University Effective Altruism Student Group and Vice President of Harvard Law School Effective Altruism.