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

Issac Newton was, in my mind, one of the founding fathers of modern science as we know it today.  He made many very important contributions.  The most important being his idea of the laws of gravity.  His work is said to have "distively advance every branch of mathmatics."      “I was like a boy playing on the sea-shore, and diverting myself now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.”