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Type A Personality
A personality type first described by two cardiologists, Friedman and Rosenman, in the 1950s. It can be understood as a set of behavioral characteristics that include intense ambition, compe tition, drive, preoccupation with responsibility, a sense of time urgency or impatience, and occasional hostility and cynicism.
Type A persons tend to be overachievers who multitask and prefer to work under the pressure of deadlines. For more information, see Friedman and Rosenman (1959).