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.
She earned her M.D. from Johns Hopkins University in 1930 and continued her scientific endeavors at Columbia-Presbyterian Hospital in New York City. Alexander assumed leadership positions as a microbiologist and program director at Columbia-Presbyterian.