[3][4][5] Huxley and Smith were close friends and were leading advocates of the perennial philosophy, which describes an underlying reality to material existence.

Huxley's 1945 book, The Perennial Philosophy, argues that the concept is revealed in the mystical branches of all the world's religions.

He has been involved in fund-raising activities for the Siddhartha School Project in Stok, Ladakh, north India, for more than ten years.

[7] This project has resulted in the construction of an elementary/ middle/high school for underprivileged Buddhist children that has been visited twice by the Dalai Lama, who holds it as a model for blending traditional and Western educational ideals.

Much of his work for this project has involved translating at lectures for (and teaching with) the school's founder, Khen Rinpoche Lobzang Tsetan, who is the abbot of the Panchen Lama's monastery near Mysore, India.

This work has also brought him into contact with several important figures in this field, including Stanislav Grof, Andrew Harvey, Huston Smith, Laura Huxley, Stephen Cope, Jeffery Kripal, and Alex Grey.