Who plays brainy smurf in the smurfs?

The Smurf who is known for being brainy is Papa Smurf. He's the oldest and wisest of the Smurfs, and often uses his knowledge and inventions to help his fellow Smurfs.

While there are other Smurfs known for their intelligence, like Brainy Smurf and Clumsy Smurf, Papa Smurf is the one most commonly associated with being the "brainy" one.