You will be given a definition of a task first, then some input of the task.
Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'From 1984 to 1993 Dr. Mitchell served as the President of the National Industrial Rehabilitation Corporation and as the Executive Director of the International Center for Industry , Labor and Rehabilitation , a private non-profit research and education group .', Argument/Subject 1: 'president', Argument/Subject 2: 'corporation'
Output:
be director of