Harald Schuh is an internationally recognized leader in the field of very long baseline interferometry (VLBI). He played a pioneering role in promoting this technology to support the establishment of the International Terrestrial Reference Frame (ITRF) and the realization of the International Celestial Reference System (ICRS). Together with international colleagues, he founded the International VLBI Service (IVS), a collaboration of organizations that operate and support global VLBI components, and he served as the chair of this organization from 2007 to 2013. Harald Schuh’s dedication to IVS and his great vision led to the development of the VLBI Global Observing System (VGOS) with a number of new radio telescopes in the United States, Japan, Germany, Spain, Norway, Sweden, Finland, and China. Harald Schuh’s passionate pursuit of frontier research in geodesy and his unselfish contribution and services to various scientific communities are impressive. He has been a member of several important national and international organizations, including chair of the Scientific Advisory Board of the German Geodetic Research Institute (DGFI) in Munich, a member of the Scientific Advisory Board of the European Optical Fibre Project NEAT-FT, a member of the Evaluation Board of the German Research Group on Satellite Geodesy (FGS), vice president of the Austrian Society for Surveying and Geoinformation (OVG), president of the Austrian Geodetic Commission (ÖGK) and of the Austrian National Committee of the International Union of Geodesy and Geophysics (IUGG), president of IAU Commission 19 on Earth Rotation, elected member of the IAG Executive Committee, and IAG president during 2015–2019. Currently he is chair of the German Geodetic Commission (DGK, 2019–2024) and chair of the LOC of the upcoming IUGG General Assembly in Berlin (2023). Harald Schuh has been a truly inspirational leader with great passion and enthusiasm for advancing geodesy not only in fundamental research but also into the wider range of governmental and ministerial levels that places geodesy in a more influential position on decision-making processes to change our society. As the former director of the Institute of Geodesy and Geophysics at the Vienna University of Technology in Austria (2002–2012) and current director of the Department of Geodesy at GFZ, the German Research Centre for Geosciences, he has been a devoted mentor and has attracted many Ph.D. students, world-class postdocs, and scientists to his research team. He fully deserves the recognition of the Ivan I. Mueller Award due to his outstanding contributions, services, and leadership in Earth system research and space geodesy leading to major progress in these fields. —Jürgen Müller, Institute of Geodesy, Leibniz University of Hannover, Hannover, Germany

I feel very honored to be receiving this AGU award, as serving the international geodetic science community, educating students, and training next-generation geodesy experts have always been a main part of my professional life. In geodesy we are living in an exciting era with new monitoring technologies, the next space missions, and upcoming satellite positioning and navigation scenarios, and I am glad to contribute to these developments. Since 2015 I have represented international science organizations such as the International Union of Geodesy and Geophysics (IUGG) and the International Association of Geodesy (IAG)—in cooperation with AGU—at the annual conference of the United Nations Global Geospatial Information Management (UN-GGIM), in New York. This allowed me to further promote science and research on a high political level and in particular to support the development of geodetic infrastructure and the education and training of next-generation geodesists. I would like to thank all my former and current colleagues who have supported my activities in the past decades, and I am proud that this award is named for Prof. Ivan I. Mueller, who was one of my predecessors as president of IAG. Promotion of geodesy is our common goal. —Harald Schuh, GFZ German Research Centre for Geosciences, Potsdam, Germany