Waldo Rudolph Tobler (November 16, 1930 – February 20, 2018) was an American-Swiss geographer and cartographer. Tobler's idea that "Everything is related to everything else, but near things are more related than distant things" is referred to as the "first law of geography." He proposed a second law as well: "The phenomenon external to an area of interest affects what goes on inside". Tobler was an active Professor Emeritus at the University of California, Santa Barbara Department of Geography until his death. Academic background In 1961, Tobler received his Ph.D. in the Department of Geography at the University of Washington at Seattle. At Washington, he participated in geography's William Garrison-led quantitative revolution of the late 1950s. After graduating in 1961, Tobler became an Assistant Professor at the University of Michigan, where he remained until moving to the University of California, Santa Barbara in 1977. Until his retirement he held the positions of Professor of Geography and Professor of Statistics at the University of California, Santa Barbara. The University of Zurich, Switzerland, awarded him an honorary doctorate in 1988. Research Tobler was one of the principal investigators and a senior scientist in the National Science Foundation-sponsored National Center for Geographic Information and Analysis. His career in geography had a profound impact on the discipline, and he is perhaps the most influential geographer of the past century. As a graduate student, he pioneered the use of computers in cartography in his 1959 paper "Automation and Cartography". This technology was extremely influential in early Geographic Information Systems. His later research emphasized mathematical modeling and graphic interpretations in geography. In the course of his research, he formulated the "first law of geography" in 1970 while producing a computer movie of Detroit. He is the inventor of novel and unusual map projections, among which was the first derivation of the partial differential equations for area cartograms. He also invented a method for smooth two-dimensional mass-preserving areal data redistribution. In 1989, the American Geographical Society awarded Tobler with the Osborn Maitland Miller Medal. Tobler was involved in building a global, latitude-longitude oriented, demographic information base with resolution two orders of magnitude better than was previously available. He also examined the development of smooth finite element and categorical pycnophylactic geographic information reallocation models. In July 1999 he presented a keynote speech, "The World is Shriveling as it Shrinks," at the ESRI International User Conference, and was the