Alright, when this draft began there were 10 names that came to mind in antiquity for me that had to be drafted. After this guy wasn't taken in the first two rounds, I figured he might fall. Watching some of the previous picks makes me think he isn't falling much further.
Now, many a scientist has been drafted so far, and each worthy. I wonder, however, how much of an actual influence on all human life those scientists have had to actual practical terms. The inventors have, sure, but has each scientist taken actually done something in a field that we each deal with on a daily basis? Maybe. But this guy has without question, and in perhaps the most important field we have in science. Medicine.
I select the Father of Medicine, Hippocrates He was the person that took medicine out of the spiritual control of oracles and gods and taught that human health was based not on angry gods but on diet, environment and every day occurances that today we take for granted.
Hippocrates began to categorize illnesses as acute, chronic, endemic and epidemic, and use terms such as, "exacerbation, relapse, resolution, crisis, paroxysm, peak, and convalescence." Another of Hippocrates' major contributions may be found in his descriptions of the symptomatology, physical findings, surgical treatment and prognosis of thoracic empyema, i.e. suppuration of the lining of the chest cavity. His teachings remain relevant to present-day students of pulmonary medicine and surgery. Hippocrates was the first documented chest surgeon and his findings are still valid.
So revered was he that after his death the progression of medicine actually stopped because it was thought that no one could be a brilliant as him and therefore there was nothing further to learn and expand on. That is an influence that many here don't have.