Final answer:
Erik Erikson depicted the life course as a series of psychosocial struggles in his psychosocial theory of development, which involves eight developmental stages from infancy to late adulthood.
Step-by-step explanation:
The individual who depicted the life course as a series of psychosocial struggles that had to be resolved is Erik Erikson. Erikson introduced the psychosocial theory of development, which posits that an individual's personality develops over the lifespan through a sequence of eight developmental stages, each characterized by a specific conflict or task. These stages range from infancy through late adulthood, and highlight the importance of social relationships in personality development. In contrast to Sigmund Freud's emphasis on the psychosexual aspects of development, Erikson focused on the psychosocial challenges and their resolutions that contribute to a healthy personality and a sense of competence.