Sangharakshita was ordained in the Theravada school, but said he became disillusioned by what he felt was the dogmatism, formalism, and nationalism of many of the Theravadin bhikkhus he met and became increasingly influenced by Tibetan Buddhist teachers who had fled Tibet after the Chinese invasion in the 1950s. Two years after his meeting with Lama Govinda he began studying with the Gelug Lama, Dhardo Rinpoche. Sangharakshita also received initiations and teachings from teachers who included Jamyang Khyentse, Dudjom Rinpoche, as well as Dilgo Khyentse Rinpoche. It was Dhardo Rinpoche who was to give Sangharakshita Mayahana ordination. Later, Sangharakshita also studied with a Ch'an teacher, Yogi Chen (Chen Chien-Ming), along with another English monk, Bhikkhu Khantipalo. Together, the three men turned their ongoing seminar on Buddhist theory and practice into a book, "Buddhist Meditation, Systematic and Practical".