William James Mayo
Doctor
Co-founder––along with his brother––of the world-renowned Mayo Clinic.
He was asked by the Sisters of Saint Francis to help make a new hospital. In return, he, along with his brother and father opened their own section.
He predicted that life expectancy in the world would be 70 years in the early 20th century-–and he was right.
He and his brother learned the basics of the profession from accompanying their father, a doctor, on house visits.
He and his brother were depicted on a postage stamp, as was Amelia Earhart.