Orvar Swenson

Initially a resident in pathology, he soon became an assistant professor of pediatric surgery at Harvard and later moved to Boston's Floating Hospital for Children as surgeon-in-chief, where he was the first pediatric surgeon on the staff at the hospital and where he began his research in Hirschsprung's disease. Subsequently he became surgeon-in-chief of Children's Memorial Hospital, where he remained until his retirement in 1973.

In 1973, Swenson was elected president of the American Pediatric Surgical Association. He authored Swenson's Pediatric Surgery, which ran into five editions and he was the recipient of a number of awards including the E. Mead Johnson Award, the William E. Ladd Medal and the Denis Browne Gold Medal.

He served as president of the American Pediatric Surgical Association in 1973–1974, and was the author of Swenson's Pediatric Surgery, a textbook that was published in five editions from 1958 to 1990. He received the E. Mead Johnson Award from the Society for Pediatric Research in 1952, the William E. Ladd Medal from the American Academy of Pediatrics in 1959, and the Denis Browne Gold Medal from the British Association of Paediatric Surgeons in 1979.

When Swenson performed the procedure in 1948, it was the first successful surgical correction of megacolon. It was not however a real Hirschsprung's, as Swenson clarified later in an interview when Bill had said to him that "this is just a weird case; it's not a real Hirschsprung's disease".

Swenson married Melva Elizabeth Criley in 1941; they had three daughters. He died in Charleston, South Carolina, in 2012, aged 103.

Swenson began his medical career as an intern at Ohio State University. After a year, he returned to Boston to work at Boston Children's Hospital and Peter Bent Brigham Hospital. Initially a resident in pathology, he took a residency in surgery from 1939 to 1945, after which he became an assistant professor of pediatric surgery at Harvard while working on the pediatric surgical staff at Boston Children's Hospital. In 1949 he moved to Boston's Floating Hospital for Children as surgeon-in-chief, making him the first pediatric surgeon on the staff at the hospital. Subsequently he moved to Chicago in 1960 to become the surgeon-in-chief of Children's Memorial Hospital, where he remained until his retirement in 1973. After his retirement from clinical practice, he moved to Miami and taught at the University of Miami until 1980.

Orvar Swenson (7 February 1909 – 13 April 2012) was a Swedish-born American pediatric surgeon. He discovered the cause of Hirschsprung's disease and in 1948, with Alexander Bill, performed the first pull-through operation in a child with megacolon, which then became a treatment for the disease.

Swenson was born in Helsingborg, Sweden, in 1909. His parents, Amanda and Carl Albert Swenson, were missionaries for the Community of Christ and relocated their family to Independence, Missouri, in 1917. Both parents died when Orvar was a teenager, and he and his brother Alvin lived in a boarding house where they started a business, Woodcraft, which sold fire-by-friction sets, bows and arrows, and field hockey sticks. Orvar graduated from William Chrisman High School in 1929 and William Jewell College in 1933. The same year, Orvar and Alvin were admitted to Harvard Medical School, where they successfully petitioned the dean to be placed in the same class so that they could share textbooks in order to save money. They graduated from Harvard in 1937.