For the first time during her testimony, the doctor's professional demeanor slipped.

It was only after he saw the second officer standing there that he assumed a more professional demeanor.

His professional demeanor took a very talented Rats roster to a 28-13 record, good for 2nd place in the league.

I assumed my professional demeanor, sure what it was.

She took several more moments to resume her professional demeanor.

Taking a deep breath, he assumed his most professional demeanor.

"Do you really think that was appropriate professional demeanor, Lieutenant?"

His crew, although maintaining their professional demeanor, nonetheless looked a bit apprehensive.

She drew herself up and resumed her professional demeanor.

"If your professional demeanor permits it, could you please offer an old woman a steady arm for the walk back to the lab?"