and weather statistics in areas undergoing military missions. The U.S. Air Force Chief of Staff officially commended him for this service. Landsberg became the acting director of the Joint Research and Development Board's Committee on Geophysical Sciences (1946) and then the director (1949). In 1949, Landsberg was appointed to the Air Pollution Committee of U.S. President Harry S. Truman, where he helped to shape U.S. air pollution regulations. Landsberg's other work included administrative service and editing. For 15 volumes from 1964, Landsberg was the editor in chief of the journal World Study of Climatology. He served at the Cambridge Research Center as Director of the Geophysics Directorate (1951-1954) and at the United States Weather Bureau as Director of the Environmental Data Service (1954-1966). He was a fellow, an honorary member, and Certified Consulting Meteorologist of the American Meteorological Society. He was president of the American Geophysical Union from 1968 to 1970. He was elected to the National Academy of Engineering in 1966. Wilfried Schröder has published memorial note on Helmut Landsberg in " Meteorologische Rundschau," 1985. Publications Landsberg's early publications dealt with earthquakes, the impact of weather on aviation, atmospheric suspensions and, most notably, cloud condensation nuclei. Landsberg published a ground-breaking worn on condensation nuclei, the submicrometre-sized particles in the air about which clouds form, which was the first to examine the role such particulate matter plays on air pollution and the degree to which it is retained in the respiratory system. This investigation was the basis of his later work on the impact of urbanization on climate. He also linked falling pressure to the onset of non-induced labor in childbirth. Throughout the 1940s, Landsberg focused on climatology. He introduced English-speaking audiences to the usefulness of statistical analysis in the field in his 1941 book, Physical Climatology. Honors Landsberg received a number of honors and recognitions throughout his career. Among his notable honors were the International Meteorological Organization Prize (1979), the William Bowie Medal of the American Geophysical Union (1978), the Outstanding Achievement in Bioclimatology Award (1983) and the Cleveland Abbey Award (1983) of the American Meteorological Society, and the National Medal of Science (1985), presented to him by US President Ronald Reagan. In recognition of his achievements, his name is associated with several awards bestowed on others. In 1986, the National Oceanic and Atmospheric Administration created the "Helmut E. Landsberg" award in his honor as "one of the preeminent