Christopher Plummer is a Canadian actor who has starred in stage, television, and film productions on both sides of the Atlantic Ocean.Mr. Plummer acts on the stage. He has talent in stage and TV productions. 'On' means on the surface of an object; here, the stage it is. 'In' indicates that one's talent in a certain field. Correct?
Correct. On the stage , however has become idiomatic for the career: Mr Plummer has been on the stage /in theatre for many years .
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