This chapter focuses on the historical socio-cultural processes of producing psychological theories, and most specifically theories of a socio-cultural kind. Psychology is a consequence of situated activities and thus the knowledge it offers is subordinated to a process of continuous cultural and historical transformation. The chapter describes how human rationality gets shaped in a socio-historical spiral, focusing on how culture establishes and distributes levels of self-reflection about human action. An analysis of the emergence of psychological theories about the socio-cultural phenomenon follows. The chapter then explains how multidisciplinary heritage produced current psychological approaches to socio-cultural phenomena. The sociocultural network of contents, reasons, and meanings, which shape subjectivity and permit to make sense of human activity is examined. Finally, the chapter argues that human behavior involves an activity oriented towards establishing the meaning of experiencing.