poobah

Etymology
From Pooh-Bah, a comic character in the Gilbert & Sullivan operetta  (1885), formed as, both expressing contempt. Libretto by, preceded by character Pish-Tush-Pooh-Bah (described as “haughty”) in “King Borriah Bungalee Boo” (1866), one of the , with and  other terms of contempt.

Noun

 * 1) A person who holds multiple offices or positions of power at the same time.
 * 2) A leader or other important person.
 * 3) A pompous, self-important person.