I'm looking for a word that describes someone that remains calm when others panic, specifically in a calamity or accident.
Example 1: Someone that is in an auto accident and they remain level-headed when others around them freak out.
Example 2: Someone that hold it together in a natural disaster while people around them break down into hysteria.
Possible sentence 1: "John is a ________. He kept it together when the hurricane hit."
Possible sentence 2: "Devin is a real ________. He was still calm after hitting that vulture with his Jeep."
(Before you ask, yes, I hit a vulture with my Jeep today.)