Leila Alice Denmark (née Daughtry; February 1, 1898 – April 1, 2012) was an American pediatrician in Atlanta, Georgia. She was the world's oldest practicing pediatrician until her retirement in May 2001 at the age of 103, after 73 years. She was a supercentenarian, living to the age of 114 years, 60 days. A co-developer of the pertussis (whooping cough) vaccine, Denmark was one of the few supercentenarians in history to gain prominence in life for reasons other than longevity. She started treating children in 1928. By the time of her retirement, Denmark was treating grandchildren and great-grandchildren of her first patients. Early life and education Born in Portal, Georgia, Leila Alice Daughtry was the third of 12 children of Elerbee and Alice Cornelia (Hendricks) Daughtry. Her paternal uncle was Missouri Congressman James Alexander Daugherty. She was the older sister of Clyde Daughtry (1910–85), who is known for shooting the only known authentic color footage of the attack on Pearl Harbor. She attended Tift College in Forsyth, Georgia, where she trained to be a teacher. She studied chemistry and physics at Mercer University in Macon. She decided to attend medical school when her fiancé John Eustace Denmark (1899–1990) was posted to Java, Dutch Indies, by the United States Department of State, as no wives were allowed to accompany their spouses to that post. Daughtry was the only woman in the 1928 graduating class of the Medical College of Georgia in Augusta, and the third woman ever to graduate from the school with a medical degree. John Eustace Denmark had returned from his overseas assignment and they married on June 11, 1928, soon after she received her medical diploma. They had one child together, Mary, on November 19, 1930. Leila Denmark was a registered Democrat and a practicing Baptist. Medical career Denmark accepted a residency at Grady Memorial Hospital in Atlanta, Georgia, and moved to the Virginia-Highland neighborhood with her husband. Denmark was the first physician on staff when Henrietta Egleston Hospital, a pediatric hospital, opened on the Emory University campus. She also developed a private practice, seeing patients in a clinic at her home. Denmark devoted a substantial amount of her professional time to charity. By 1935, she was a listed staff member at the Presbyterian Church Baby Clinic in Atlanta, while serving at Grady and maintaining a private practice. She conducted research from the 1930s, and especially from 1933