Walter Reed's Life Span Walter Reed worked in the U.S Army as a Physician. He worked in and around the subject area of Yellow Fever. In 1901 he led the team which confirmed Carlos Finlay's theory that Yellow Fever is actually transmitted through a certain species of mosquitos rather than through direct contact. This insight led to the enhancement of the fields of Microbiology and Epidemiology. The insight also led to the almost immediate completion of the Panama Canal. (13 sept 1851 año