John Warren Aldrich (1906-1995) was a Research Associate of the Division of Birds of the National Museum of Natural History. Aldrich's interest in natural history began in his youth, with participation in bird walks and summer nature camps. After receiving his Ph.D. in biology from Brown University in 1928, Aldrich began his career at the Buffalo Museum of Science. In 1930, he joined the staff of the Cleveland Museum of Natural History as a biological assistant. Upon receipt of his Ph.D. in 1937, from Western Reserve University, Aldrich was appointed Curator of Ornithology at the Cleveland Museum. In 1941, Aldrich joined the staff of the Fish and Wildlife Service as a biologist; in 1947, he was appointed Chief of the Section of Distribution and Migration of Birds; in 1951, Chief of the Section of Distribution of Birds and Mammals; and in 1957, Staff Specialist, Branch of Wildlife Research. During his tenure with the Fish and Wildlife Service, Aldrich was located in the United States National Museum, Division of Birds, where he worked with the national collections. Because of his long association with the Division, Aldrich was appointed a Research Associate upon his retirement in 1973. Aldrich's research interests included the taxonomy of North American birds, breeding bird population studies, bird banding, bird distribution studies, ecology, endangered species, and wildlife management. Aldrich was active in many professional organizations including: the Audubon Society, American Ornithologists Union, Baird Ornithological Club of Washington, D.C., Biological Society of Washington, Cosmos Club, International Council for Bird Preservation, Washington Biologists Field Club and Wilderness Society.