Many actors in this film had experience in the play. John Gielgud had played Mark Antony at the Old Vic Theatre in 1930 and Cassius at the Shakespeare Memorial Theatre in Stratford-upon-Avon in 1950, James Mason had played Brutus at the Abbey Theatre in Dublin in the 1940s, and John Hoyt, who plays Decius Brutus, also played him in the Mercury Theatre's 1937 stage version. Gielgud later played the title role in the 1970 film with Charlton Heston, Jason Robards and Richard Johnson (as Cassius) and in a stage production directed by John Schlesinger at the Royal National Theatre. John Houseman, who had produced the famous 1937 Broadway version of the play starring Orson Welles and the Mercury Theatre, also produced the MGM film. By this time, however, Welles and Houseman had had a falling out, and Welles had nothing to do with the 1953 film. P. M. Pasinetti, Italian-American writer, scholar, and teacher at UCLA served as a technical advisor.