Churchill's hospital appointments included attending paediatrician at the Cook County Hospital and Presbyterian Hospital and president of the medical staff at Children's Memorial Hospital from 1909–1917.
He was also an associate professor of paediatrics at Rush Medical College.
In 1912, he was resident physician to the American Geographic Society of New York's expedition to the west coast.

Between 1911 and 1919 he was chief editor of the American Journal of Diseases of Children, and in 1916–17 was president of the American Pediatric Society.

He left his position at Children's Memorial Hospital in 1917 to serve as a major in the United States Army during the First World War.
After the war he became more involved in public health.
He held senior positions with Chicago Board of Health, the Chicago Milk Commission, the Infant Welfare Society of Chicago and the Juvenile Psychopathic Institute.
Churchill's hospital appointments included attending paediatrician at the Cook County Hospital and Presbyterian Hospital and president of the medical staff at Children's Memorial Hospital from 1909–1917. He was also an associate professor of paediatrics at Rush Medical College. In 1912, he was resident physician to the American Geographic Society of New York's expedition to the west coast.
Between 1911 and 1919 he was chief editor of the American Journal of Diseases of Children, and in 1916–17 was president of the American Pediatric Society.
He left his position at Children's Memorial Hospital in 1917 to serve as a major in the United States Army during the First World War. After the war he became more involved in public health. He held senior positions with Chicago Board of Health, the Chicago Milk Commission, the Infant Welfare Society of Chicago and the Juvenile Psychopathic Institute.
Frank Spooner Churchill