Christopher Nolan
Although he has never been nominated for the Best Director award, Christopher Nolan is definitely Oscar material. The man behind the legendary Dark Knight trilogy, Inception, The Prestige and Memento (to name a few) is extremely underrated; when you think of all the directors who have won the Oscar (some of whom should never have won), it is mind-boggling how this great man has never even had a nomination. While Memento and Inception may have earned him nominations for Best Original Screenplay, and Inception was given an Oscar nod for Best Picture, Nolan should have won an Oscar by now, especially for films like The Dark Knight and Interstellar.