What is a Unix Wizard?

[I ran across these on a Unix salesman's wall and haven't seen them posted
 before.  I modified them here and there.  Followups are in net.jokes.]
People who come into contact with the Unix system are often told, 
"If you have trouble, see so-and-so, he's a guru", or "Bob there is
a real Unix hacker."

What is a "Unix Wizard"?  How does s/he differ from a "guru"?

To explore these and other questions, here is a draft of the "Unix Hierarchy":

NAME                DESCRIPTION AND FEATURES

beginner        - insecure with the concept of a terminal
                - has yet to learn the basics of vi
                - has not figured out how to get a directory
                - still has trouble with typing <RETURN>
                  after each line of input

novice                - knows that "ls" will produce a directory
                - uses the editor, but calls it "vye"
                - has heard of "C" but never used it
                - has had a bad experience with rm
                - is wondering how to read mail
                - is wondering why the person next door
                  seems to like Unix so very much

user                - uses vi and nroff, but inexpertly
                - has heard of regular expressions but never seen one.
                - has figured out that '-' precedes options
                - has attempted to write a C program but decided
                  to stick with Pascal
                - is wondering how to move a directory
                - thinks that dbx is a brand of stereo component
                - knows how to read mail and is wondering how
                  to read the news

knowledgeable        - uses nroff with no trouble, and is beginning
user                  to learn tbl and eqn
                - uses grep to search for fixed strings
                - has figured out that mv(1) will move directories
                - has learned that "learn" doesn't help
                - somebody has shown her how to write C programs
                - once used sed but checked the file afterward
                - watched somebody use dbx once
                - tried "make" but used spaces instead of tabs

expert                - uses sed when necessary
                - uses macros in vi, uses ex when necessary
                - posts news at every possible opportunity
                - is still wondering how to successfully reply to mail
                - writes csh scripts occasionally
                - writes C programs using vi and compiles with make
                - has figured out what && and || are for
                - uses fgrep because somebody said it was faster

hacker                - uses sed and awk with comfort
                - uses undocumented features of vi
                - writes C code with "cat >" and compiles with "!cc"
                - uses adb because she doesn't trust source debuggers
                - figured out how environment variables are propagated
                - writes her own nroff macros to supplement the standard
                  ones
                - writes Bourne shell scripts
                - installs bug fixes from the net
                - uses egrep because she timed it

guru                - uses m4 and lex with comfort
                - writes assembler code with "cat >"
                - uses adb on the kernel while the system is loaded
                - customizes Unix utilities by patching the source
                - reads device driver source with breakfast
                - uses "ed" because "ex" is a Berkeleyism
                - can answer any unix question after a little thought
                - uses make for anything that requires two or more commands
                - has learned how to breach security but no longer
                  needs to try
                - is putting James Woods/Henry Spencer egrep into her
                  next Unix release

wizard                - writes device drivers with "cat >"
                - fixes bugs by patching the binaries
                - posts her changes to Unix utilities to the net --
                  and they work
                - can tell what question you are about to ask, and answer it
                - writes her own troff macro packages
                - is on a first-name basis with Dennis, Bill, and Ken