Maurice Hilleman
Maurice Hilleman was one of the most important vaccinologists in history. Over his lifetime, Hilleman developed more than 40 vaccines, including those for diseases like measles, mumps, rubella, hepatitis A, hepatitis B, and several others. Despite being so incredibly productive, Hilleman was also not interested in becoming famous. He didn't name any of his discoveries after himself and -- despite running a very tight ship (as one who was as productive as he was must've) -- was known to be intellectually modest. One estimate claims that his vaccines saved over eight million lives a year, an astounding figure by any metric.
