Walter S. Bowman (1865-1938) was a professional photographer who worked in Pendleton, Oregon, from the late 1880s to the mid 1930s. Bowman's photographs document daily life in Eastern Oregon, including special events such as the Pendleton Round-Up. The collection consists of almost 800 negatives and prints representative of the span of the photographer's work, but his noted images of tribal people were largely destroyed after his death.
Thomas Leander "Lee" Moorhouse (1850-1926) was a photographer and businessman in Pendleton, Oregon. From 1888 to 1916 he produced over 9,000 images documenting urban, rural, and Native American life in the Columbia Basin and Umatilla County, Oregon. The collection consists primarily of glass-plate negatives.