Douglass, Andrew Ellicott -

(1867-1962): An American astronomer who established the science of dendrochronology. As a professor of astronomy and physics at the University of Arizona, Douglass was interested in the history of the 11-year sunspot cycle and searched for this cycle in tree rings hoping that trees would respond to climate change provoked by the solar cycle. He was able to produce a 2000-year chronology for the Southwest, and his Arizona Tree-Ring Laboratory became the leading institution in the world for tree-ring studies.