If you're a fan of unique, cult-classic Westerns, chances are you've seen a Sergio Leone movie. Probably most famous for his series he filmed with Clint Eastwood (Fistful of Dollars, For A Few Dollars More and The Good, The Bad and The Ugly) this Italian born director created a new look and movie style all on his own. With his unique style of incredible close ups and extremely wide shots, and a gritty, realistic style of characters, Leone changed the face of Westerns for the rest of time.
Fistful of Dollars was the start of both Leone's career in what would be named 'Spaghetti Westerns' and it would also start the career of a very young Clint Eastwood. Aside from the new style and story for Westerns, Leone probably made the biggest splash on American Old Westerns by the simple fact that he didn't even speak English and was raised in Italy. He would continue on in his directing career with another 5 films in America and a fistful of awards and nominations.
*On a side note, Leone was always looking for ways to motivate his actors, he once unleashed a vicious dog unsuspectingly, causing the actor to run around in blind panic.