From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be officer of', Sentence: 'Mr. Rittenhouse served as President and Cheif Executive Officer of the Uniform Code Council , Inc. from February 1997 to January 2004 , continuing a career marked by vision , determination , innovation , organizational effectiveness and fiscal responsibility .'
Officer