Task: Text Categorization
Input (English): This man proposed the mechanism of the epigenetic principle, and his work partially springs from his observations of the Yurok tribe. Before collecting his speeches in the compilation Insight and Responsibility, this thinker collaborated with Kivnick on an examination of Vitality in Old Age. One of this man's books describes the process through which the concept of satyagraha emerges, while another book examined "The meaning of meaning it" and described its subject's "fit in the choir. " The author of Ghandi's Truth, this person set forth contrasts like integrity and despair, autonomy and shame, and industry versus inferiority. For 10 points, identify this author of Young Man Luther and Childhood and Society, the psychologist who developed the identity crisis and eight psychosocial stages of development. 
Output (English): Social Science