Jack Dangermond and Roger Tomlinson are the third and fourth recipients of the National Geographic Society's Alexander Graham Bell Medal (www.nationalgeographic.com). The award for achievement in geographic research has been made only once before, to Bradford and Barbara Washburn in 1980.

Dangermond founded the Environmental Systems Research Institute (ESRI), which has the largest GIS software install base in the world, in 1969. Tomlinson spearheaded GIS technology in the 1960s for the Canada Land Inventory. (www.urisa.org)