wear more than one hat
To hold or function in more than one position or role simultaneously. Few know that the renowned actress wears more than one hat, splitting her time as an accomplished neuroscientist.
wear more than one hat
and wear two hatsFig. to have more than one set of responsibilities; to hold more than one office. The mayor is also the police chief. She wears more than one hat. I have too much to do to wear more than one hat. He wears two hats; he's both CEO and chairman of the board.