 While at Cambridge McKellen was a member of the Marlowe Society , appearing in Henry IV ( as Shallow ) alongside Trevor Nunn and Derek Jacobi ( March 1959 ) , Cymbeline ( as Posthumus , opposite Margaret Drabble as Imogen ) and Doctor Faustus . His first professional appearance was in 1961 at the Belgrade Theatre , as Roper in A Man for All Seasons , although an audio recording of the Marlowe Society 's Cymbeline had gone on commercial sale as part of the Argo Shakespeare series . 
