Transpersonal psychology is an approach to psychology that 1) studies phenomena beyond the ego as context for 2) an integrative/holistic psychology. This provides a framework for 3) understanding and cultivating human transformation (Hartelius et al., 2013).
Hartelius, G., Rothe, G., & Roy, P. J. (2013). A brand from the burning: Defining transpersonal psychology. In H. L. Friedman & G. Hartelius (Eds.), The Wiley-Blackwell handbook of transpersonal psychology (1st ed., pp. 3–22). Malden, MA: Wiley & Sons.