Social psychologist examined group decision making among political experts and found that major blunders in u. s. history may be attributed to pressure toward group conformity

Irving Janis

Explanation:

Irving Janis is a social psychologist that developed the theory of groupthink (Victims of Groupthink: A Psychological Study of Foreign-Policy Decisions and Fiascoes,1972). Janis studied the psychological mechanism that led to foreign policy resolutions like the Pearl Harbor bombing, the Vietnam War, and the Bay of Pigs invasion.

Janis’s theory approaches the way groups composed of very intelligent people are likely to make faulty choices. To do so,  Janis analises group behaviors, possible biases, and influences that may affect group decision making.

answer; participant observation method;

answer; exploratory;