Thomas Brown Brook (1890-1966) was the son of a Nevada City gold miner who came to Montana in 1863. His father, John Brook, established a ranch on the Beaverhead River eight miles south of Twin Bridges, Montana in 1870, and Thomas grew up on the ranch and attended local schools. Thomas Brook graduated from the Gallatin County High School in Bozeman and in 1913 earned a degree in Civil Engineering from Montana State College. After working on a ranch and serving in France during World War I, Brook returned to Twin Bridges where he worked as an electrician. As a hobby, Brook began taking photographs of various locations in and around Twin Bridges. Eventually, he engaged in copying historical photographs brought to him by various individuals. Before his death in 1966, Brook had compiled a substantial collection of both original and copied photographs. The Thomas Brook Photograph Collection consists of nature landscapes and town views of southwest Montana, particularly in Twin Bridges area of Madison and Beaverhead Counties. Subjects include: natural history, ranch and farming operations, bridges and bridge construction, mining and timber outfits, schools and school groups, and early settlers of the Twin Bridges area.