I'd say Socrates. I loved his debate approach to philosophy and his ability to take apart philosophical issues. I tried to do this myself when I was a teenager and helped foster a love for debate and ruthlessly critical thinking. Socrates was the first philosopher with a strong cult following of many intellectual fans, and stirred a lot of controversy. He made philosophy cool by going out and debating the beliefs of the time.
As best as can be ascertained, Socrates was a foot soldier in at least three large battles and had the experience of being sword meat.
Carl Jung. I believe in his theory of synchronicity, and dreams. He believed that there are no such things as coincidences.
Pamphleteer, Thomas Paine. I consider him to be America's Godfather. He wrote in a language that the common folks could understand and made his writing for free. Read, The Writings Of Thomas PaineAmerica's Godfather. I thought it was a great biography of him. By the author of The Elephant Man.
No philosopher has affected me in any way. My influence comes from human behavior, common sense and natural law.
Oh, and I almost forgot Thomas Nagel. What is it Like to be a Bat? completely blew my mind and still does.