Ernest Hemingway knew what was up!
"The introduction of this 1958 Paris Review interview with Hemingway briefly describes Papa’s upright working setup:
A working habit he has had from the beginning, Hemingway stands when he writes. He stands in a pair of his oversized loafers on the worn skin of a lesser kudu — the typewriter and the reading board chest-high opposite him.
Other famous users of standing desks included Winston Churchill, Lewis Carroll, Donald Rumsfeld, Charles Dickens, Otto von Bismarck, Henry Clay, Thomas Jefferson, John Dos Passos, and Virginia Woolf. (thx, megnut)”