Dr. Robert J. Behnke (December 30, 1929 – September 13, 2013), a fisheries biologist and conservationist, was recognized as a world authority on the classification of salmonid fishes. He was popularly known as "Dr. Trout" or "The Trout Doctor". His seminal work, Trout and Salmon of North America, was published in 2002 and he wrote a regular column for Trout Magazine, the quarterly publication of Trout Unlimited. He was a fisheries biologist with the U.S. Fish and Wildlife Service in the Colorado Cooperative Fish and Wildlife Research Unit and a professor with Colorado State University in the 1970s. He became a Professor Emeritus Department of Fishery and Wildlife Biology, Colorado State University.