Arthur Marx, also known as Harpo Marx, was an American comedian, actor, mime artist, and musician. He was the second oldest of the Marx Brothers and is best remembered for his portrayal of a mute character, Harpo. Harpo was his stage name, which is derived from the Latin word 'harpo' meaning 'I play'. He was known for his comedic skills, physical comedy, and musical talent. He was also a successful author and composer.