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Reuben Ottenberg (1882 in New York City – 1959) was an American physician and haematologist, who served Mount Sinai Hospital in New York City with distinction for 50 years. He received his B.A. from Columbia University in 1902 and his M.D. degree from the College of Physicians and Surgeons three years later. In 1954 Ottenberg was the first to be awarded the Karl Landsteiner Award from theAmerican Society of Blood Banks for "distinguished pioneering contributions to blood banking and hemotherapy."