Given the task definition and input, reply with output. 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 chairman of', Sentence: 'Dr Alan Greenspan , Chairman of the US Federal Reserve , and Mr Mervyn King , Governor of the Bank of England , both received the degree of Doctor Honoris Causa at the ceremony .'
Chairman