If you ask me to name a cryptographer, Scheier is by far the first one that comes to mind. Also, in my experience, his book, Applied Cryptography, is by far the most reccomended book for people new to crypto.
Update: I said "terrible book" but I'm going to start being more precise about this. It's not a terrible "book"; I enjoyed the hell out of it when I was a teenager. It's just misleading and dangerous.