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Abstract Federal advisory committees related to science and technology are important mechanisms for connecting policy-makers with independent experts and the broader public. The balance of represented expertise and viewpoints shapes a committee’s intended advisory role, consensus building processes, and the quality and impact of its policy recommendations. This paper presents the first historical analysis of the President’s Council of Advisors on Science and Technology (PCAST) and examines its changing balance of social and professional perspectives from 1990 to 2023. We demonstrate that PCAST’s balance has shifted to be more inclusive of different social groups and professional backgrounds over time, particularly under President Biden. We conclude with recommendations for future White House science policy advisory bodies to ensure they are adequately representative of the diversity of perspectives in the US research enterprise and the overall US population. 

US national expert advisory bodies related to science, technology, and innovation (STI) policy have a wide range of missions, governing structures, operational practices, cultures, and impact on federal policymaking. This paper offers an analytical framework for assessing the autonomy, function, and influence of of the President's Council of Advisors on Science and Technology (PCAST), a federal advisory committee consisting of 30 elite scientists, engineers, and industry leaders appointed by and advising the president. We demonstrate that PCAST carries both a strong instrumental advisory role, providing substantive advice to White House STI policy development, and a significant symbolic advisory role, offering visible public support to presidential decisions and initiatives related to STI. However, we find that the council's engagement with either or both roles has shifted depending on its available resources, the policy agenda of the administration it serves, the level of presidential attention, and the priorities of council leadership. The paper concludes with recommendations to guide future PCASTs in fulfilling their mission and appropriately influencing US national STI policy.