Who’s Who in Orthopedics Senn was the first surgeon to advocate the reduction and nailing of hip fractures on the basis of animal experiments. In this aspect he was far ahead of his time. When his paper, “The treatment of fractures of the neck of the femur by immedi- ate reduction and permanent fixation,” was first presented at the meeting of the American Surgi- cal Association on June 1, 1883, its concepts were vigorously opposed by all of his listeners, pro- voking Senn to say: “Any person who can hit the head of a femur in a cat will certainly not miss it in operating on a human subject.” However, because of this opposition, he eschewed nailing his patients with hip fractures and treated them by reduction and immobilization in plaster spicas, a method popularized by Royal Whitman. His emphasis on the importance of the impaction of the fractures after reduction was echoed years Nicholas SENN later by Cotton.1 1844–1908 Reference Nicholas Senn was born in Switzerland and was brought by his immigrant parents to Fond du Lac, 1. Salmonsen EM (1928–1935) Nicholas Senn, MD, Wisconsin, as a child. After graduating from the PhD, LLD, (1844–1908) Master surgeon, patholo- local high school, he taught school for a short gist, and teacher. Bulletin of the Society for Medical time before working as a preceptee with a local History (Chicago) 4:268 physician. He graduated from the Chicago Medical School in 1868 and was an intern at the Cook County Hospital for 18 months, before returning to a rural practice in Wisconsin. After 6 years, he moved to Milwaukee and was on the staff of the Milwaukee Hospital. In 1877, he spent a year studying in Munich with Professor Nussbaum, who had visited Lister and was a strong advocate of antiseptic–aseptic surgery. After his return to the United States, Senn was made professor of surgery in the College of Physi- cians and Surgeons in Chicago, and moved on to become professor of surgery at the Rush Medical College in 1888. About this time, his surgical clinic was one of the busiest in the world, and he attracted international students. A man of inexhaustible energy, Senn wrote incessantly, traveled, served as a medical officer in the Spanish–American War, and even found time to serve as president of the American Medical Asso- ciation in 1897. He was chairman of the editorial board at the inception of Surgery, Gynecology, Newton M. SHAFFER and Obstetrics in 1905. Following his death in 1908, his library of 40,000 volumes and 60,000 1846–1928 pamphlets became the nucleus of the great medical reference section of the John Crerar Newton M. Shaffer succeeded Charles Fayette Scientific Library in Chicago. Taylor as chief of the New York Orthopedic Dis- 303