Alexander Winchell (b. 1824; d. 1891) was a professor of geology at the University of Michigan and director of the Geological Survey of Michigan.

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Professor of geology and paleontology at the University of Michigan, director of the Michigan Geological Survey, and chancellor of Syracuse University, popular lecturer and writer on scientific topics and as a Methodist layman who worked to reconcile traditional religious beliefs to nineteenth-century developments in the fields of evolutionary biology, cosmology, geology, and paleontology. Papers include extensive diaries, field notes and maps from travels and geological expeditions, correspondence, speeches, articles and other publications and photographs.