Let's say examples of negative emotions are sadness and despair, and example of positive emotions are happiness and pride.
So is there a word that describes a person who has total, complete control over his negative and positive emotions? I'm talking about someone who can manage his emotions in a long-lasting way, not just temporarily. Generally speaking I'm looking for an adjective, but a noun will also be useful.
1.When images of scenes that normally trigger strong emotions were shown to him he demonstrated no emotion
2.His face did not display any emotion despite the [sad]news just relayed to him.