Over the years, Hollywood has produced some truly wonderful actors and their roles in some of cinema's most iconic and beloved pictures have helped shape a generation of movie-goers, film-makers and younger waves of acting talent. These actors have done more than shape than the landscape of cinema; they helped create it.
The actors on this list have made their careers out of being themselves. Each are as unique and as powerful as the last in their own way, all full of great roles and commitment. All act because they need to; there's nothing else for them, and their passion for the craft - which they each have perfected - is palpable with every frame of a movie in which they appear.
The films in which these stars played vital roles helped make cinema what it is today, and without their talent, grace and mastery of the craft of acting our screens would be much less bright today.
Be they comedians turned kings and queens of the dramatic, method actors with a uncanny ability to become every character they play, women who defied stereotypes or the every-man who captured the true essence of human nature, all 20 actors on this list have more than earned their place.