Daniel Klem, Jr., Ph.D., D.Sc. is a Sarkis Acopian Professor of Ornithology and Conservation Biology at Muhlenberg College in Allentown, Pennsylvania. Dr. Klem obtained his B.Sc. at Wilkes University and his M.Sc. at Hofstra University. He served in the US military during the Vietnam War, and was awarded the Bronze Star Medal. He subsequently obtained his doctorate from Southern Illinois University.

Over the past 44 years and continuing, he has dedicated his life to studying, writing, and teaching about the threat that sheet glass and plastic pose to birds. No other scientist has comprehensively studied and published research results documenting and preventing the lethal threat that human structures pose to birds. In his 1990 papers “Bird injuries, cause of death, and recuperation from collisions with windows” and “Collisions between birds and windows: mortality and prevention”, he calculated that between 100 million and 1 billion birds are killed, annually, in the United States alone, by flying into windows.

His research has influenced the design of buildings, not least the Niagara Falls State Park Observation Tower, on which he was a design consultant. He holds several US patents relating to windows design. He is motivated by available and growing evidence that bird-building collisions are an important wildlife conservation, building industry, and animal welfare issue for birds and people worldwide.