Type A Personality
Friedman and Rosenman conducted studies on the relationship between stress and heart disease. One of the outcomes was the discovery of Type A and Type B personalities. People who are classified as having Type A personality have characteristisc like: they have a sense of time urgency, find it difficult to relax, and often become impatient and angry when they get delayed (or if they are going to be late) or are around other people whom they view as incompetent. They are the opposite of Type B people.
See also: Type A Behavior Pattern