Jeremy Samuel Piven (born July 26, 1965) is an American actor and comedian. He is best known for his role as Ari Gold in the comedy series Entourage, for which he won a Golden Globe Award and three consecutive Emmy Awards. He also starred in the British period drama Mr Selfridge, which tells the story of the man who created the English department store Selfridges, and portrayed Spence Kovak on Ellen DeGeneres's sitcom Ellen.
Source : Wikipedia