Michael McElroy is a rare combination of scientist, scholar, educator and visionary leader in science and its applications to human welfare and the natural world. His sound advice and profound insights in all these areas have been sought and appreciated by fellow scientists, students and government leaders. For his extensive and far-reaching accomplishments in science and their relevance to society, McElroy exemplifies the highest ideals of this most prestigious AGU award.

Over six distinguished decades of service, McElroy has led transformative advancements across many scientific fields and disciplines, including planetary science, atmospheric chemistry, energy and environmental policy. His pioneering work on planetary atmospheres, particularly those of Mars and Venus, has revolutionized our understanding of the composition, evolution and dynamics of these distant worlds, setting the foundation for generations of future research in planetary science. McElroy's investigations into Earth's atmosphere have been equally groundbreaking. His trailblazing contributions to atmospheric chemistry in regard to ozone depletion and climate change have played a decisive role in shaping the direction of international environmental protocols such as the Montreal Protocol, which has been a key factor in protecting our planet from harmful ultraviolet radiation.

His unwavering commitment to fostering collaboration and cooperation in research is a key pillar of the William Bowie Medal. As an inspirational educator, McElroy has guided and inspired countless young scientists by nurturing an inclusive and supportive environment that fosters collaboration, curiosity and creativity. His lifelong dedication to diversity and inclusion has empowered individuals from diverse backgrounds, ensuring that the scientific community benefits from a rich variety of perspectives and talents. The generations of exceptionally skilled scientists he has mentored, many of whom have gone on to build top-tier research careers in Earth and planetary sciences, have not only enriched his own research and leadership but have also contributed significantly to advancing the broader scientific community.

McElroy has been a motivating force and leading spokesman in many areas. He has served on numerous NASA space and Earth science advisory committees to promote stratospheric research, support advanced technology for improved space-based and in situ weather and climate observations, and chart new directions for space and Earth science exploration. His inspirational leadership and far-reaching research contributions continue to guide both progress and policy in some of the most critical global challenges that we face today, in particular the cause and consequences of global climate change and sustainable development of the global environment.

—James E. Hansen
Earth Institute at Columbia University
New York, New York