| A | B |
| Hippocrates | "Father of Medicine", introduced scientific approach and ethics |
| Monks | Cared for sick in dark and middle ages, kept ancient medical writings |
| Galen | Studied and drew early anatomy text, used animals and fallen gladiators |
| Andreas Vesalius | Published accurate anatomy drawings |
| Rene Laenec | Invented the stethoscope |
| Anton van Leeuwenhoek | Invented the microscope |
| William Harvey | Accurately described circulation of blood |
| Edward Jenner | Discovered smallpox vaccine by using cowpox |
| Ignaz Semmelweis | Introduced handwashing into care of childbearing women, preventing childbed fever |
| Louis Pasteur | Proved that microorganisms cause disease |
| Joseph Lister | Used antiseptic spray during surgery to prevent infection |
| Wilhelm Roentgen | Discovered X-rays |
| Alexander Fleming | Discovered penicillin in mold |
| Jonas Salk and Albert Sabin | Developed vaccines to prevent polio |
| Florence Nightingale | Made nursing a respectable profession, drastically decreased deaths of soldiers |
| Clara Barton | Nurse in Civil War, founded Red Cross |
| Sigmund Freud | His studies formed basis of psychology and psychiatry |
| Romans | Had good sanitation and designated places for this sick, early hospitals |
| Greeks | Observed and measured effects of disease |
| Hebrews | Had laws concerning handling of food which prevented illness |