<p>1. Christian Barnard: First successful heart transplant 2. Anton Van Leeuwenhoek: Ground lenses for microscope to view germs 3. Ignaz Semmelweis: First to begin antiseptic methods in childbirth 4. Ernest Von Bergmann: Introduced steam sterilization of dressings 5. Edward Jenner: Developed smallpox vaccine 6. Sir Alexander Fleming: Discovered penicillin 7. Jonas Salk: Developed vaccine to prevent polio 8. Ann Sullivan Macy: Teacher of Helen Keller 9. Sigmund Freud: Founded psychoanalysis 10. Wilheim Roentgen: Discovers X-ray 11. Rene Laennec: Invented the stethescope 12. Louis Pasteur: Cure for rabies, pasteurization 13. Leonardo Da Vinci: Anatomical medical drawings 14. Charles Drew: Blood plasma and transfusions 15. Clara Barton: Founded the American Red Cross 16. Joseph Priestley: Discovered oxygen, nitrous oxide 17. Hipocrates: Father of modern medicine 18. Florence Nightingale: Reformed the nursing profession 19. Cicely Saunders: Pioneer of hospice movement 20. Samuel Hahnemann: Founded homeopathy 21. Oliver Wendel Holmes: 1st to introduce surgical anesthetics, of anatomy at Harvard 22. William Harvey: Describe the circulation of blood 23. George Dadd: 1st promoter of general anesthesia in veterinary practice 24. Dr. D.H. Williams: 1st black surgeon, 1st open heart surgery 25. Lillian Wald: home nursing and first public school clinic 26. Johan F. Meischer: isolated DNA from WBC nuclei 27. Gregor Mendel: inheritance of traits 28. Walter Sutton: chromosomal theory of inheritance 29. Herman J. Muller: induced mutations using X-rays 30. Griffiths: 1st to identify transforming principals 31. Beadle and Tatum: one gene one enzyme 32. Paul Berg: spliced viral and bacterial DNA 33. Thomas Morgan: proved genes carried on chromosomes (fruit flies) 34. Charles Darwin: theory of evolution 35. De Vries and Correns: Verified Mendels results 36. Sturtevant: First gene maps (mapping of chromosomes) 37. Wilson and Stevens: X and Y sex determination (Edmund Beecher Wilson & Nettie Maria Stevens) 38. Hershey and Chase: blender experiment (genetic info is in DNA not proteins) 39. Delbruck and Luria: 1st to study bacteriophages 40. Avery: transforming principal = DNA</p>