William Healey Dall

William Healey Dall (August 21, 1845 – March 27, 1927) was an American naturalist, a prominent malacologist, and one of the earliest scientific explorers of interior Alaska. He described many mollusks of the Pacific Northwest of North America, and was for many years America's preeminent authority on living and fossil mollusks.

Dall also made substantial contributions to ornithology, zoology, physical and cultural anthropology, oceanography, and paleontology. In addition he carried out meteorological observations in Alaska for the Smithsonian Institution. Provided by Wikipedia