Caption: The official portrait of Mark Twain (1835--1910) as doctor of letters, (honoris causa, Oxford University, 1907) in academic dress (see Wikipedia: Mark Twain: Later life and death).
What good's an alias if everyone knows you are really old Sam Clemens?
Yours truly's favorite misquote from Mark Twain:
Another goody: On being told he was not getting the Nobel Prize in Literature: