Elminster,
The sage from Shadowdale
is just the kind of wizard
you'd expect to have a study
such as this.
Probably with more mess
and books, lots of books.
He is very old. Enough for
most people to know him as an
old man, beard and all.
As a sage his expertise is
Magic (of course), monsters
and other worlds. The last
one being the result of
his many travels.
Not only is he the greatest wizard
of his world - "Faerun" - but he
specializes in traveling magic
making moving between dimensions,
planes of existence and worlds seem
almost casual.
Elminster, too, tends to fit
the Wizard Sage description.
He usually doesn't interfere in
anything unless he decides it's
important enough, and then, too
he gives advice or a little
help but seldom participates
fully in the adventure.