The Professor (Sergio Marquina) is a fictional character in the Netflix series Money Heist, portrayed by Álvaro Morte. In the TV show, he is the main character, he is the mastermind of the heist who assembled the group, and Berlin's brother.

The Professor is the leader of the gang and the one who carefully plans and organizes the assault on the Royal Mint and the Bank of Spain in Madrid. With a remarkable culture, but with a nerdy appearance and components. The idea of the first heist is to avenge his father. His grandfather had fought against the fascists in Italy.