She earned her M.D. from Johns Hopkins University in 1930 and continued her research and medical career at Columbia-Presbyterian Hospital in New York City. Alexander became the lead microbiologist and the head of the bacterial infections program at Columbia-Presbyterian.
In 1930, she received her M.D. from Johns Hopkins University and pursued her research and medical work at Columbia-Presbyterian Hospital in New York City. Alexander took on the role of lead microbiologist and head of the bacterial infections program at Columbia-Presbyterian.