In my photography, there are two groups of folks who inspire me: A group of teachers and pros to whom I aspire to someday be able to emulate, and a group of my "friends" who push, cajole, critique and otherwise inspire me to improve my photography. I wonder who inspires you and why?
I'll start:
Pros
Bryan Peterson, who I have never met, but who has written so many clear, simple books on photography and has been able to put things in a way I can understand and apply (hope to one day meet him and perhaps even attend a workshop)
James Moore, Pennsylvania professional, teacher, workshop leader, mentor and friend (can be seen at http://www.transient-light.com/ )
Ray Laskowitz, working professional photographer and friend; Ray's vision always inspires, and his real-world comments and observation always help me adjust perspective. When I think I have done something really creative, I go look at Ray's images to see how far I have to go yet

Arnold John Kaplan; professional photographer, teach and friend, famed for his pioneering images of Vermont. At 90 plus, Arnold is still speaking, writing and doing projects about photography. How can that NOT inspire anyone?
Friends and Colleagues (some you know, some you don't :-
In the second category, there are so many. Many of you here like Al, Carol, Dean, George, Brandt and others I am sure I have left out, but not purposely and so many others I have known over the years.