The author of Family, Socialization, and the Interaction Process, and The Social System, in his best known work he discussed the Unit Act of Social Systems.  
The author of Eisenhower's statement that "freedom means the freedom to fail as well as to succeed", this social theorist was also a pioneer in the field of medical sociology. His educational theories centered on role allocations, while he posited that Ascription and Achievement were the two poles on his Axis of Social Stratification. The author of Family, Socialization, and the Interaction Process, and The Social System, in his best known work he discussed the Unit Act of Social Systems.  FTP, identify this sociologist, best known for The Structure of Social Action.
The author of Eisenhower's statement that "freedom means the freedom to fail as well as to succeed", this social theorist was also a pioneer in the field of medical sociology.
Talcott Parsons