Dawson was a lifelong photographer of birds and had over his career authored numerous articles and books on the subject. His major works were
Birds of Ohio: A Complete Scientific and Popular Description of the 320 Species of Birds Found in the State (1903),
Birds of Washington: A Complete Scientific and Popular Description of the 372 Species of Birds Found in the State (1909) and
Birds of California: A Complete Scientific and Popular Description of the 580 Species of Birds Found in the State (1923). In California, Dawson, a proponent of using bird motifs in art, maintained a studio at Los Colubris in
Mission Canyon near
Santa Barbara where he displayed his extensive
oology and photographic collection. In 1916 he founded the Museum of Comparative Oology on his Mission Canyon property that soon became the
Santa Barbara Museum of Natural History. Dawson served as the museum's first director until 1925 when
Ralph Hoffmann, a
natural history teacher and amateur ornithologist, was named to replace him. Dawson also founded The Birds of California Publishing Company and was involved with several ornithology and nature conservation clubs. ==Marriage==