In Melbourne in 1929 McMahon revived the repertory movement under the "Gregan McMahon Players" and in 11 years placed about 90 plays on the stage, including several of the later Shaw plays; Pirandello's Right You Are and Six Characters in Search of an Author; several plays by James Bridie; and others by Galsworthy, Drinkwater, W. Somerset Maugham, G. K. Chesterton, Eugene O'Neill, Seán O'Casey, Daviot and Casella, in the presentation of which a generally high standard was reached.
In Melbourne in 1929, McMahon revived the repertory theatre movement under his own company, staging over 90 plays within 11 years, including notable works by Shaw, Pirandello, Bridie, Galsworthy, Maugham, and others, showcasing a high level of quality.