an oceanographer notable for his contribution to the understanding of global change, "for outstanding contributions in atmospheric sciences, atmosphere-ocean coupling, atmosphere-land coupling, biogeochemical cycles, climate, or related aspects of the Earth system." The Waldo E. Smith Medal (established 1982), named after Waldo E. Smith, the first Executive Secretary of AGU, to recognize "individuals who have played unique leadership roles in such diverse areas as scientific associations, education, legislation, research, public understanding of science, management, and philanthropy, and whose accomplishments have greatly strengthened and helped advance the geophysical sciences." The Walter H. Bucher Medal (established 1966), named after Walter Hermann Bucher, a former AGU president and major contributor to crustal problems, "for original contributions to the basic knowledge of the crust and lithosphere." The William Bowie Medal is the highest AGU honor and is awarded at most annually for "outstanding contributions to fundamental geophysics and for unselfish cooperation in research"; its namesake was the first recipient in 1939. Sections The AGU is divided into 25 sections that provide the main structure for managing volunteers, developing leaders and honoring scientists. These sections also reflect the breadth of science within Earth and space science: atmospheric and space electricity; atmospheric sciences; biogeosciences; cryosphere sciences; Earth and planetary surface processes; Earth and space science informatics; education; geodesy; geohealth; geomagnetism; paleomagnetism and electromagnetism; hydrology; mineral and rock physics; natural hazards; near surface geophysics; nonlinear geophysics; ocean sciences; paleoceanography; planetary sciences; seismology; societal impacts and policy sciences; space physics and aeronomy; study of the Earth's deep interior; tectonophysics; volcanology, geochemistry, and petrology. Meetings AGU holds an annual meeting every December (known as the Fall Meeting). Until 2017, the meeting was held yearly in San Francisco. Because of renovations at the San Francisco venue, the 2017 meeting took place in New Orleans and the 2018 meeting in Washington, DC. It returned to San Francisco in 2019 and its location will rotate among San Francisco, New Orleans, Chicago, and Washington, DC. Previously, a second meeting was held every Spring (April through May) in locations around the world. The latter grew out of AGU's annual Spring meeting, which had been held for many years in Baltimore, until declining interest caused AGU to move the meeting to different locations, starting with Boston in 1998. With the 2003 meeting in Nice, France, it became known as the Joint Assembly because AGU co-sponsors it with other societies such as the Geochemical Society, the