Field collector, Army physician, naturalist on U.S. Northern Boundary Commission and U.S Geological and Geographical Survey of the Territories. Best known for publications "Key to North American Birds", "Check List of North American Birds", "Field Ornithology" and "Bibliography of North American Ornithology". Founding member of American Ornithologists' Union. Member of the National Academy of Sciences.

In Memoriam <PDF> (Wilson Bulletin)

In Memoriam <PDF> (Nat. Act. Sci.)