The final sentence of the Declaration of Independence is a promise among the signers, to "mutually pledge to each other our Lives, our Fortunes, and our Sacred Honor," and many of them and their fellow patriots did in fact sacrifice their lives and fortunes in service to our country.
He brought a new way of looking at the world of math. He brought challenges and acuity to equations and even science. There is not a person who doesn't know who he is.