When you think science what scientist comes to mind? What was this person(s) contributions and why do you admire them?

When I think of science Albert Einstein comes to my mind. He made many contributions to science. A Few examples are general relativity, effecting a revolution in physics. He is also known as the father of modern phyics. I admire him for winning the noble peace prize in 1921 for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect.