Johnnie Walker, the Diageo-owned Scotch brand, announced today that Martin Scorsese the director of Taxi Driver, Raging Bull and Goodfellas will star in the next international 'Keep Walking' television and cinema ad for the brand. According to the company, the new film features clips of De Niro from Taxi Driver. It is the latest in the series of ads that have also featured Harvey Keitel and Roberto Baggio. The theme of the ads encourages people to 'Keep Walking' to achieve their dreams.